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Encyclopedia > Water softener

A water softener reduces calcium or magnesium concentration in hard water.
General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Atomic mass 40. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... Water (from the Old English word wæter; c. ...


A water softener comes in two forms, either beads-filter or zeolite chemical-matrix-filter form. They work by replacing calcium and magnesium ions with sodium ions. Zeolite Zeolites (Greek, zein,to boil;lithos,a stone) are minerals that have a porous structure. ... General Name, Symbol, Number sodium, Na, 11 Chemical series alkali metals Group, Period, Block 1, 3, s Appearance silvery white Atomic mass 22. ...

Contents


Problems with hard water

Hard water can contain many magnesium and calcium ions. The ions dissolve easily in water, and due to cohesion, they tend to stick together. They also tend to bond with other substances, such as copper. When a few ions bond with such substances, other ions will, in turn, bond with them. These ions can cause problems with metal structures. The ions build up as deposits inside water pipes and water heaters, eventually clogging the pipes. In many households, calcium or magnesium may build up in cookware, especially in coffee machines and kettles. The clusters of calcium and magnesium ions forms what could be described as "scale," or, more informally, "buildup." Additionally, when one showers or washes their hands in hot water, the ions react with the soap to form a sticky "scum," which hinders the soap's ability to lather properly. An ion is an atom or group of atoms with a net electric charge. ... This is page is a about the computer concept Cohesion, for the concept in chemistry see Cohesion (chemistry). ... A chemical bond is the phenomenon of atoms being held together in molecules or crystals. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance copper, metallic Atomic mass 63. ... This article is about a common cleaning compound. ...


To alleviate problems with hard water, it can be treated to reduce the calcium and magnesium concentration. Many ways exist for this; however, for households, most of those are much too expensive. One inexpensive solution is to use a water softener, which many households use.


How it works

The softener is filled with sodium designed for use in water softeners. Sodium is fairly inexpensive, and it does not create massive deposits or react with soap, so it is ideal to rectify hard water problems. Water flows through zeolite or past the beads in the softener. The filters are saturated with sodium ions, and when calcium and magnesium ions come along, they swap places with the sodium ions. In the end, magnesium and calcium ions remain on the beads or in the zeolite matrix, while sodium ions enter into the water. Eventually, all that remains inside the matrix or beads in the softener are calcium and magnesium ions. Dirty filters can then either be replaced or regenerated.


See also

Ion exchange is a process in which ions are exchanged between a solution and an ion exchanger, an insoluble solid or gel. ... An ion exchange resin is an insoluble matrix (or support structure) normally in the form of small (1-2mm diameter) beads, fabricated from an organic polymer substrate on the surface of which are sites with easily trapped and released ions in a process called ion exchange. ... Water purification, or drinking water treatment, is the process of removing contaminants from surface water or groundwater to make it safe and palatable for human consumption. ...

External links

  • How Stuff Works

  Results from FactBites:
 
Howstuffworks "How does a water softener work?" (390 words)
The solution to hard water is either to filter the water by distillation or reverse osmosis to remove the calcium and magnesium, or to use a water softener.
Filtration would be extremely expensive to use for all the water in a house, so a water softener is usually a less costly solution.
Salt is sodium chloride, so the water softener mixes up a very strong brine solution and flushes it through the zeolite or beads (this is why you load up a water softener with salt).
Water Softeners: Water softener faqs and info (2187 words)
Water Softener: Water softener systems reduce the hardness of water by replacing the hardness minerals - calcium and magnesium ions (other cations will be removed as well) - with another ion, frequently sodium.
Water is considered slightly hard if it has between 1-3.5 grains per gallon (gpg) of hardness minerals, moderately hard 3.5-7gpg, hard 7-10.5gpg, and very hard 10.5+ gpg.
Used extensively in both water and air filtration, GAC works on the principle of adsorption, where substances in water are attracted to, and adhere to the surface of the carbon.
  More results at FactBites »


 

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