A Dishwasher

A two drawer DishDrawer dishwasher.

A dishwasher is a mechanical device for cleaning dishes and eating utensils. They can be found in restaurants and also in the kitchens of many private residences. Image File history File links Download high resolution version (800x1066, 134 KB)Dishwasher, open and loaded with dishes Photographer: wax115 Source: Stock. ... Image File history File links Download high resolution version (800x1066, 134 KB)Dishwasher, open and loaded with dishes Photographer: wax115 Source: Stock. ... Image File history File linksMetadata Download high-resolution version (480x640, 106 KB) Summary This picture shows a different design of dish washer by Fisher & Paykel from New Zealand. ... Image File history File linksMetadata Download high-resolution version (480x640, 106 KB) Summary This picture shows a different design of dish washer by Fisher & Paykel from New Zealand. ... A DishDrawer model DishDrawers are a model of dishwashing machines made by Fisher & Paykel. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Some dishware Dishware is a general term for objects—dishes—from which people eat or serve food, such as plates and bowls. ... Cutlery refers to any hand implement used in preparing, serving, and especially eating food in the Western world. ... A typical restaurant in uptown Manhattan A restaurant is an establishment that serves prepared food and beverages to be consumed on the premises. ... A kitchen is a room used for food preparation and sometimes entertainment. ...

How dishwashers work

Unlike manual dishwashing, which relies largely on physical scrubbing to remove soiling, the mechanical dishwasher cleans by spraying hot (55-65 degrees Celsius or 130-150 degrees Fahrenheit) water on the dishes. First detergent-added water is used for cleaning purposes, then clean water to remove the detergent residue. Some dishwashers have multiple wash and rinse periods within the complete cycle. In some dishwashers, a rinsing aid can be added to the rinse cycle. As there is no human contact during the process, strong detergents may be used which would be too alkaline for habitual exposure to the skin. Many dishwashers also contain a heating element to achieve fast drying and sanitation of the dishes. In some models, this element can also be used to heat the hot water to the desired wash temperature.^[1] To meet Wikipedias quality standards, this article or section may require cleanup. ... For other uses, see Celsius (disambiguation). ... For other uses, see Fahrenheit (disambiguation). ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... Laundry detergents are just one of many possible uses for detergents Detergent is a compound, or a mixture of compounds, intended to assist cleaning. ... The common (Arrhenius) definition of a base is a chemical compound that either donates hydroxide ions or absorbs hydrogen ions when dissolved in water. ... This article is about the organ. ... For other uses, see Temperature (disambiguation). ...

Human dishwashers

The word dishwasher may also refer to a person who washes dishes in a commercial setting. These employees rinse dishes, load them into a stainless steel dishwasher, unload them, and stack them into their respective dish holders. Pots and pans are also washed by hand by scrubbing them in a soap and water mix, immersing them in a rinse of plain water, and then immersing them in a water/sanitizer solution for a period. Silverware is washed by placing loose silverware in a tray, washing them several times like this, then sorting them into circular holders, and washing them again in the dishwasher.

History

The first reports of a mechanical dishwashing device are of an 1850 patent by Joel Houghton of a hand-powered device. For the game, see: 1850 (board game) 1850 (MDCCCL) was a common year starting on Tuesday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Sunday [1] of the 12-day-slower Julian calendar). ...

Modern dishwashers are descended from the 1886 invention of Josephine Cochrane, also hand-powered, which she unveiled at the 1893 Chicago World's Fair. Cochrane was quite wealthy and was the granddaughter of John Fitch, the inventor of the steamboat. She never washed dishes herself and only invented the dishwasher as her servants were chipping her fine china. Year 1886 (MDCCCLXXXVI) was a common year starting on Friday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Wednesday of the 12-day slower Julian calendar). ... This article does not cite any references or sources. ... Year 1893 (MDCCCXCIII) was a common year starting on Sunday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Tuesday of the 12-day slower Julian calendar). ... For other uses, see Chicago (disambiguation). ... One-third scale replica of Daniel Chester Frenchs Republic, which stood in the great basin at the exposition, Chicago, 2004 The Worlds Columbian Exposition (also called The Chicago Worlds Fair), a Worlds Fair, was held in Chicago in 1893, to celebrate the 400th anniversary of Christopher... John Fitch (born on January 21, 1743 in South Windsor, Connecticut, died by suicide July, 1798) was a clockmaker, brassworker, and silversmith who built the first recorded steam powered ship in the United States, in 1786. ... For other uses, see Steamboat (disambiguation). ...

Models installed with permanent plumbing arrived in the 1920s. In 1937, William Howard Livens invented a small dishwasher suitable for use in a domestic setting. It had all the features of a modern dishwasher, including a front door for loading, a wire rack to hold crockery and a rotating sprayer.^[2] Electric drying elements were added in 1940. A plumber wrench for working on pipes and fittings A complex arrangement of rigid steel piping, stop valves regulate flow to various parts of the building. ... The 1920s they were sexy referred to as the Jazz Age or the Roaring Twenties, usually applied to America. ... Year 1940 (MCMXL) was a leap year starting on Monday (link will display the full 1940 calendar) of the Gregorian calendar. ...

Adoption was greatest at first in commercial environments, but by the 1970s dishwashers had become commonplace in domestic residences in the US. The 1970s decade refers to the years from 1970 to 1979, also called The Seventies. ...

Characterization

Capacity

The international standard for the capacity of a dishwasher is expressed as standard place settings. Dishes or plates of irregular sizes may not fit properly in a dishwasher's cleaning compartment, so it is advisable to check for compatibility before buying a dishwasher. Table setting refers to the way to set a table with tableware—such as eating utensils and dishware—for serving and eating. ...

Commercial dishwashers are rated as plates per hour. The rating is based on standard sized plates of the same size. The same can be said for commercial glass washers, they are based on standard glasses, normally pint glasses.

Size

Dishwashers that are installed into standard kitchen cabinets have a standard width and depth of 60 cm (Europe) or 24 inches (US), and most dishwashers must be installed into a hole a minimum of 86 cm (Europe) or 34 inches (US) tall. Portable dishwashers exist in 45 and 60 cm (Europe) 18 and 24 inch (US) widths, with casters and attached countertops. Dishwashers may come in standard or tall tub designs; standard tub dishwashers have a service kickplate beneath the dishwasher door that allows for simpler maintenance and installation, but tall tub dishwashers have approximately 20% more capacity and better sound dampening from having a continuous front door. This article is about the unit of length. ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial unit of length. ... This article is about the unit of length. ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial unit of length. ... This article is about the unit of length. ... An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... Sound proofing is any mechanism used to reduce the conduction of sound through a barrier or into a soundproofed chamber. ...

Features

The inside of a dishwasher, called the tub, can be composed of plastic or stainless steel. Stainless steel tubs resist hard water, provide better sound dampening, and preserve heat to dry dishes faster. They also come at a price premium. Older models used a baked enamel on steel and are prone to chipping and erosion; chips in the baked enamel finish must be cleaned of all dirt and corrosion then patched with a special compound or even a good quality two-part epoxy. For other uses, see Plastic (disambiguation). ... The 630 foot (192 m) high, stainless-clad (type 304) Gateway Arch defines St. ... Not to be confused with heavy water. ... Sound proofing is any mechanism used to reduce the conduction of sound through a barrier or into a soundproofed chamber. ... In chemistry, epoxy or polyepoxide is a thermosetting epoxide polymer that cures (polymerizes and crosslinks) when mixed with a catalyzing agent or hardener. Most common epoxy resins are produced from a reaction between epichlorohydrin and bisphenol-A. The first commercial attempts to prepare resins from epichlorohydrin occurred in 1927 in...

Mid-to-higher end North American dishwashers often come with hard food disposal units, which behave like miniature garbage (waste) disposal units that eliminate large pieces of food waste from the wash water. One manufacturer that is known for omitting hard food disposals is Bosch, a German brand; however, Bosch does so in order to reduce noise. If the larger items of food waste are removed before placing in the dishwasher, pre-rinsing is not necessary even without integrated waste disposal units. Pre-rinsing under a running tap beforehand simply wastes water. North American redirects here. ... This article is about the kitchen appliance. ... Logo of Robert Bosch GmbH Robert Bosch GmbH [1] is a German corporation which was started in 1886 by Robert Bosch in Stuttgart, Germany. ...

Many newer dishwashers feature microprocessor-controlled, sensor-assisted wash cycles that adjust the wash duration to the quantity of dirty dishes (sensed by changes in water temperature) or the amount of dirt in the rinse water (sensed chemically/optically). This can save water and energy if the user runs a partial load. In such dishwashers the electromechanical rotary switch often used to control the washing cycle is replaced by a microprocessor but most sensors and valves are still required to be present. However, pressure switches (some dishwashers use a pressure switch and flow meter) are not required in most microprocessor controlled dishwashers as they use the motor and sometimes a rotational position sensor to sense the resistance of water, when it senses there is no cavitation it knows it has the optimal amount of water. A microprocessor incorporates most or all of the functions of a central processing unit (CPU) on a single integrated circuit (IC). ... Not to be confused with censure, censer, or censor. ... For other uses, see Temperature (disambiguation). ... A rotary switch is a type of switch that is used on devices which have two or more different states or or modes of operation, such as a three-speed fan or a CB radio with multiple frequencies of reception or channels. A rotary switch consists of a shaft or... A valve is a mechanical device that regulates the flow of fluids (either gases, fluidised solids, slurries or liquids) by opening, closing, or partially obstructing various passageways. ... Cavitating propeller model in a water tunnel experiment High speed jet of fluid impact on a fixed surface. ...

Most dishwashers include a large cone or similar structure in the bottom dish rack to prevent placement of dishes in the centre of the rack. The dishwasher directs water from the bottom of the dishwasher up through this structure to the upper wash arm to spray water on the top dish rack. Some dishwashers, including many models from Whirlpool and Kitchenaid, use a tube attached to the top rack that connects to a water source at the back of the dishwasher which allows full use of the bottom rack. Whirlpool Corporation (NYSE: WHR) is the worlds leading manufacturer and marketer of major home appliances,with annual sales of approximately $18 billion, more than 73,000 employees, and more than 70 manufacturing and technology research centers around the world. ... KitchenAid Stand Mixer in action KitchenAid is a home appliance brand owned by Whirlpool Corporation that is most well known for their stand mixers. ...

Some dishwashers include a child-lockout feature to prevent accidental starting or stopping of the wash cycle by children. A child lock can sometimes be included to prevent young children opening the door during a wash cycle. This prevents accidents with hot water and strong detergents used during the wash cycle.

Sound Damping

Modern dishwashers are quieter than older models. Using blankets, panels, and sound-absorbing materials in various configurations, dishwashers can achieve sound damping levels down to 44 decibels or so. Undampened, low-end dishwashers generally output noise levels of anywhere from 65-70 decibels. Manufacturers generally use their own nomenclature with sound damping, i.e. QuietGuard (Kenmore), QuietPartner (Whirlpool), Whisper Package (Maytag), etc. How this nomenclature translates into decibel level is different for every manufacturer. The decibel is a dimensionless unit (like percent) that is a measure of ratios on a logarithmic scale. ... The decibel is a dimensionless unit (like percent) that is a measure of ratios on a logarithmic scale. ... Kenmore may refer to: Kenmore, Scotland. ... Whirlpool Corporation (NYSE: WHR) is the worlds leading manufacturer and marketer of major home appliances,with annual sales of approximately $18 billion, more than 73,000 employees, and more than 70 manufacturing and technology research centers around the world. ... Headquarters of the Maytag Corporation, Newton, Iowa Maytag Corporation (NYSE: MYG), is a $4. ...

Detergent

Dishwashing detergent contains: Laundry detergents are just one of many possible uses for detergents Detergent is a compound, or a mixture of compounds, intended to assist cleaning. ...

• Phosphates (30 %)
  • Dissolves calcium and magnesium ions to prevent 'hard-water' type limescale deposits.
• Oxygen-based bleaching agents (older-style powders and liquids contain chlorine-based bleaching agents)(1-5 %)
  • Breaks up and bleaches organic deposits.
• Non-ionic surfactants (5%)
  • Lowers the surface tension of the water, emulsifies oil, lipid and fat food deposits, prevents droplet spotting on drying.
• Enzymes
  • Breaks up and dissolves protein-based food deposits, and possibly oil, lipid and fat deposits. Proteases do this by breaking down the proteins into smaller peptides that are more easily washed away.
• Anti-corrosion agents
  • Often sodium silicate, prevents corrosion of dishwasher components.

Dishwashing detergent may also contain: Surfactants, also known as tensides, are wetting agents that lower the surface tension of a liquid, allowing easier spreading, and lower the interfacial tension between two liquids. ... A water spot is an area of dried mineral deposits left on a surface after being allowed to air dry. ... Ribbon diagram of the enzyme TIM, surrounded by the space-filling model of the protein. ... Sodium silicate, also known as water glass or liquid glass, available in aqueous solution and in solid form, is a compound used in cements, passive fire protection, refractories, textile and lumber processing. ...

• Anti-foaming agents
  • Used as foam decreases the effectiveness of the washing action.
• Additives to slow down the removal of glaze & patterns from glazed ceramics
• Perfumes
• Anti-caking agents (in granular detergent)
• Starches (in tablet based detergents)
• Gelling agents (in liquid/gel based detergents)
• Sand (inexpensive powdered detergents)

Dishwasher detergents are strongly alkaline (basic). The common (Arrhenius) definition of a base is a chemical compound that either donates hydroxide ions or absorbs hydrogen ions when dissolved in water. ... Acids and bases: Acid-base extraction Acid-base reaction Acid dissociation constant Acidity function Buffer solutions pH Proton affinity Self-ionization of water Acids: Lewis acids Mineral acids Organic acids Strong acids Superacids Weak acids Bases: Lewis bases Organic bases Strong bases Superbases Non-nucleophilic bases Weak bases edit In...

Inexpensive powders may contain sand, which can be verified by dissolving the powder in boiling water and then passing the solution through a coffee filter. Such detergents may harm the dishes and the dishwasher. Powdered detergents are more likely to cause fading on china patterns ^[3]. Used coffee filter A coffee filter is a coffee-brewing utensil, usually made of disposable paper, but recently stainless steel. ...

Biodegradable detergent

Besides chemical detergents for dishwashers, biodegradable detergents also exist for dishwashers. These detergents may be more environmentally friendly than conventional detergents.

Hand-washing detergent

Hand-washing dish detergent (washing up liquid) should not be used in a dishwasher, as it will create a large foam of bubbles which will leak from the dishwasher. If hand-washing detergent is accidentally used, the foam may be removed by spraying with salt, and the dishwasher should be forced into a drain cycle to remove the soap and water.

Rinse aid

Rinse aid (sometimes called rinse agent) contains surfactants that prevent droplet formation by reducing the surface tension of the water, so that it drains from the surfaces in thin sheets, rather than forming droplets.

The benefits of using it are that it prevents 'spotting' on glassware (caused by droplets of water drying and leaving behind dissolved limescale minerals), and can also improve drying performance as there is less water remaining to be dried. Limescale is the hard, off-white, chalky deposit found in kettles, hot-water boilers and the inside of inadequately maintained hot-water central heating systems. ...

Dishwasher salt

Dishwasher salt is used to recharge the built-in ion-exchange water softener in dishwashers. Unlike salt used for culinary purposes, it does not have added iodide salts. However, it should have minimal iron and manganese salt content, as these mineral ions tend to form precipitates that clog the ion-exchange resin. Dishwasher salt is a particular grade of commercially available crystalline sodium chloride. ... An iodide ion is an iodine atom with a −1 (negative one) charge. ...

Some dishwasher detergents are marketed as not requiring the use of dishwasher salt. These instead use increased levels of phosphates to increase the solubility of hard water ions. In very hard water areas, the amount of phosphate may be insufficient, requiring the additional use of salt in any case.^[4] Some newer dishwashers have a setting for "all in one" tablets. Incorrect use of "all in one" tablets may not be covered under the warranty; it's advisable to check the instruction book when using these types of tablets.

Pouring table salt or detergent into the salt compartment is not recommended, as it will damage the water softener unit.

Hazing of glassware, prohibition on dishwashing lead crystal

Glassware washed by dishwashing machines can develop a white haze on the surface over time. This may be caused by any or all of the below processes, only one of which is reversible: Haze is an atmospheric phenomenon where dust, smoke and other pollutant particles obscure the normal clarity of the sky. ...

Limescale deposit

If the dishwasher has run out of the salt that recharges the ion exchange resin that softens the water, and the water supply is 'hard', limescale deposits can appear on all items, but are especially visible on glassware. It can be removed by cleaning with vinegar or lemon juice, or a proprietary limescale removal agent. The dishwasher should either be recharged with salt, adjusted appropriately for the hardness of the supply water - or possibly this is a symptom of failure of the ion exchange resin in the water softener (which is one of the more expensive components). The resin may have stopped working because it has been poisoned by iron or manganese salts in the supply water. Limescale is the hard, off-white, chalky deposit found in kettles, hot-water boilers and the inside of inadequately maintained hot-water central heating systems. ... Ion exchange resin beads An ion exchange resin is an insoluble matrix (or support structure) normally in the form of small (1-2 mm diameter) beads, usually white or yellowish, fabricated from an organic polymer substrate. ...

Silicate filming/etching/accelerated crack corrosion

This film starts as an iridescence or 'oil-film' effect on glassware, and progresses into a 'milky' or 'cloudy' appearance (which is not a deposit) that cannot be polished off or removed like limescale. It is formed because the detergent is strongly alkaline (basic) and glass dissolves slowly in alkaline aqueous solution. It becomes more soluble in the presence of silicates in the water (added as anti-metal-corrosion agents in the dishwasher detergent). In certain cases, the etching will primarily be seen in areas that have microscopic surface cracks as a result of the items' manufacturing.^[5] Limitation of this undesirable reaction is possible by controlling water hardness, detergent load and temperature (see Maytag Web site, Troubleshooting on spotting and filming on the dishes). The type of glass is an important factor in determining if this effect is a problem. In hard-water areas more detergent is needed to help prevent etching, and some dishwashers can reduce this etching effect by automatically dispense the correct amount of detergent throughout the wash cycle based on the level of water hardness programmed. GE Appliances website For the hazard, see corrosive. ...

Physical abrasion

Glassware placed such that it is physically touching can abrade and produce a milky surface.

Devitrification

Components found in dishwasher detergents can chemically scour the glass, causing tiny crystals, which can precipitate further crystal growth that can turn entire glasses cloudy^[6] A vitrification experiment for the study of nuclear waste disposal at Pacific Northwest National Labs Vitrification is a process of converting a material into a glass-like amorphous solid which is free of any crystalline structure, either by the quick removal or addition of heat, or by mixing with an... Vitreous refers to a material in an amorphous, glassy state (in contrast to a crystalline state). ...

Lead crystal should not be cleaned in a dishwasher as the corrosive effect of dishwasher detergent is high on such types of glass - that is, it will quickly go 'cloudy'. In addition, the lead in the crystal glass can be converted into a soluble form, which is not good for the health of subsequent users.^[7] Lead crystal beads Lead crystal, (also called crystal), is lead glass that has been hand or machine cut with facets. ...

Items that should not be put in a dishwasher

Some items can be damaged if washed in a dishwasher because of the effects of the chemicals and hot water. Lead crystal will be irreversibly damaged if put in a dishwasher, while aluminium items will discolour. Saucepan manufacturers often recommend handwashing due to the harsh effects of the chemicals on the pan coatings.^[8] Valuable items - such as antiques - should be washed by hand as they may be dulled or damaged, and detergents will gradually fade the glazing and print. Sterling silver and pewter will oxidize and discolour from the heat. Furthermore, pewter has a low melting point and may warp in some dishwashers.^[9] Cast iron is likely to rust in a dishwasher.

Items soiled by wax, cigarette ash or anything which might contaminate the rest of the wash load (such as poisons or mineral oils) should not be put in a dishwasher. Objects contaminated by solvents may explode in a dishwasher. Glued items, such as some cutlery handles or wooden cutting boards, may be melted or softened if dishwashed, especially on a hot wash cycle when temperatures can reach 75 °C; these high temperatures can also damage plastic items which are labelled as not being dishwasher safe, however some plastic items can be distorted or melted if placed in the bottom rack too close to an exposed heating element, hence many dishwasher-safe plastic items advise placing in the top rack only (many newer dishwashers have a concealed heating element away from the bottom rack entirely). Squeezing plastic items into small spaces may cause the plastic to distort in shape. For other uses, see Solvent (disambiguation). ... A wooden chopping board with a chefs knife. ... A heating element converts electricity into heat through the process of Joule heating. ...

Dishwashers should only be used to wash normal household items, like plates, cutlery, cups, mugs, kitchenware etc. Items such as paintbrushes, tools, furnace filters etc. should not be put into a dishwasher as this will cause the subsequent washes to become contaminated and may cause damage to the appliance.

Drying

The heat inside the dishwasher dries the contents after the final hot rinse. Rinse aid is used in the final rinse cycle to allow water to run off items and prevent water droplets forming. Plastic and non-stick items may not dry properly compared to china and glass, which hold the heat better. Some dishwashers incorporate a fan to improve drying.

Chemical drying agents such as Jet-Dry are also available.

Governmental agencies often recommend air-drying dishes by either disabling or stopping the drying cycle to save energy.^[10]

Level of sanitizing

Dishwashers do not sterilize the utensils, as proper sterilization requires autoclaving at 121 °C with pressurized wet steam for at least 15 minutes. Commercial dishwashers can use one of two types of sanitizing methods: hot water sanitizing (using final rinse water at a temperature of at least 83 °C (180 °F)), or chemical sanitizing (by injecting chlorine in the final rinse water). Not all dishwashers are capable of reaching the high temperature required for hot water sanitizing. Medical grade dishwashers and sanitizers are starting to use ultrasonic cleaners^{[citation needed]}, which use a liquid bath treated with sonics to remove particles and sterilize instruments. Sterilization (or sterilisation) refers to any process that effectively kills or eliminates transmissible agents (such as fungi, bacteria, viruses and prions) from a surface, equipment, foods, medications, or biological culture medium. ... Front loading autoclaves are common Stovetop autoclaves need to be monitored carefully and are the simplest of all autoclaves Multiple large autoclaves are used for processing substantial quantities of laboratory equipment prior to reuse, and infectious material prior to disposal. ...

Most consumer dishwashers use a 75°C thermostat in the sanitizing process. During the final rinse cycle, the heating element and wash pump are turned on, and the cycle timer (electronic or electromechanical) is stopped until the thermostat is tripped. At this point, the cycle timer resumes and will generally trigger a drain cycle within a few timer increments.

Most consumer dishwashers use 75°C rather than 83°C for reasons of burn risk, energy consumption, total cycle time, and possible damage to plastic items placed inside the dishwasher. With new advances in detergents, lower water temperatures (50-55°C) are needed to prevent premature decay of the enzymes used to eat the grease and other build-ups on the dishes. This also saves energy and can allow the washer to be hooked directly to the hot water supply for the house.

In the US, residential dishwashers can be certified to a NSF International testing protocol which verifies the cleaning and sanitation performance of the unit.^[11] NSF International NSF International, formerly National Sanitation Foundation, is a not-for-profit, non-governmental organization that develops standards and provides product certification and education in the field of public health and safety. ...

Commercial dishwashers

Large heavy-duty dishwashers are available for use in commercial establishments (e.g. hotels, restaurants) where a large number of dishes must be cleaned. Commercial machines can wash a rack of dishes in just a few minutes. In the UK, the British Standards Institute set standards for dishwashers. In the US, the NSF International (an independent not-for-profit organization) sets the standards for wash and rinse time along with minimum water temperature for chemical or hot water sanitizing methods.^[12] There are many types of commercial dishwashers including under counter, single tank, conveyor, flight type, and carousel machines. British Standards is the new name of the British Standards Institute and is part of BSI Group which also includes a testing organisation. ... NSF International NSF International, formerly National Sanitation Foundation, is a not-for-profit, non-governmental organization that develops standards and provides product certification and education in the field of public health and safety. ...

Dishwashers and the environment

Dishwashers versus washing dishes by hand

Please help improve this section by expanding it. Further information might be found on the talk page or at requests for expansion.

Comparing the efficiency of automatic dishwashers and hand-washing of dishes is difficult because hand-washing techniques vary drastically by individual. At least one peer-reviewed study concludes that automatic dishwashers when fully loaded use less electricity, water, and detergent than even the most efficient hand-washers. ^[13] In particular, higher-end dishwashers that are capable of heating water internally do not lose heat during transport to a sink. The study does not address costs associated with the manufacture and disposal of dishwashers, the cost of possible accelerated wear of dishes from the chemical harshness of dishwasher detergent or the value of labour saved. Image File history File links This is a lossless scalable vector image. ...

Dishwasher detergents and rinse aids

Most dishwasher detergent contains complex phosphates, as they have several properties that aid in effective cleaning. However, the same chemicals have been removed from laundry detergents in many countries as a result of concerns raised about the increase in algal blooms in waterways caused by increasing phosphate levels (see eutrophication). The State of Maryland is considering a bill to limit phosphates in dish detergent to help clean up the Chesapeake Bay.^[14] A phosphate, in inorganic chemistry, is a salt of phosphoric acid. ... Algal blooms can present problems for ecosystems and human society An algal bloom or marine bloom or water bloom is a rapid increase in the population of algae in an aquatic system. ... Eutrophication, strictly speaking, means an increase in chemical nutrients -- typically compounds containing nitrogen or phosphorus -- in an ecosystem. ... Official language(s) None (English, de facto) Capital Annapolis Largest city Baltimore Largest metro area Baltimore-Washington Metropolitan Area Area  Ranked 42nd  - Total 12,407 sq mi (32,133 km²)  - Width 101 miles (145 km)  - Length 249 miles (400 km)  - % water 21  - Latitude 37° 53′ N to 39° 43′ N...

In addition, rinse aids have contained nonylphenol and nonylphenol ethoxylates. These have been banned in the European Union by EU Directive 76/769/EEC. Nonylphenol is an organic compound of the wider family of alkylphenols. ...

References

1. ^ How dishwashers work
2. ^ William Howard Livens (1924-10-23). Improvements in apparatus for washing household crockery and the like. FR579765. UK Intellectual Property Office. Retrieved on 2008-03-04.
3. ^ Hotpoint Service - Appliance Repairs, Spare Parts and Accessories for Hotpoint, Creda, Ariston
4. ^ Dishwashing in hard water areas
5. ^ http://www.scienceblog.com/community/older/2003/F/20033788.html Dishwashers and microscopic scratches}
6. ^ Ancient glass and vitrification
7. ^ "Lead Contamination In Our Environment"
8. ^ Cooking equipment and dishwashers
9. ^ Dishwashers and silver
10. ^ Top 10 Tips for Renters : ENERGY STAR
11. ^ NSF Consumer Information: Residential Appliances and Other Products for the Home
12. ^ NSF aticle on dishwashers
13. ^ Stamminger, Rainer (2003). "A European Comparison of Cleaning Dishes by Hand". Proceedings of EEDAL conference. Retrieved on 2008-02-17. 
14. ^ Md. Dish Soap Bill Might Help Clean Bay

2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 63rd day of the year (64th in leap years) in the Gregorian calendar. ... 2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 48th day of the year in the Gregorian calendar. ...

See also

• Home appliances
• Dishwasher salt
• Dishwashing

Home appliances are electrical/mechanical appliances which accomplish some household functions, such as cooking or cleaning. ... Dishwasher salt is a particular grade of commercially available crystalline sodium chloride. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

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