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Explanation: The process of removal of hardness from water is called softening.
Reverse Osmosis (Membrane Technology) This is an effective method for both water purification and water softening. It uses a number of stages to produce highly purified water. Calcium and magnesium ions are eliminated at the reverse osmosis membrane chamber where a pressure of about 35 psi is applied.
The major disadvantage to softening water is the potential health risks for people that might be on low sodium diets. The exchange of hardness minerals for sodium adds 7.5 milligrams per quart for each gpg of hardness removed. In addition, calcium and magnesium are eliminated from the homeowner's diet.
Ion exchange is a common industrial method of water softening. It is accomplished by passing the water through columns of a natural or synthetic resin that trades sodium ions for calcium and magnesium ions.
For most healthy adults, the amount of sodium added to tap water by softening is too small to be harmful or cause any health concern. It's safe to drink and doesn't change the way the water tastes.
Advantages of home water softeningPrevents build-up of minerals (scale) on the inside of pipes, fixtures, and hot water heaters. Lengthens the life of some appliances. Reduces or prevents mineral spots on glassware. Prevents or reduces soap films and detergent curds in sinks, bathtubs, and washing machines.
Disadvantages of Using a Water SoftenerThe end products may be too soft for some people!Too much sodium.Not suitable for irrigation.They are expensive to install and maintain.The alternatives are also expensive.Messing with dietary mineral requirements.
MethodsIon-exchange resin method.Lime softening.Chelating agents.Washing soda method.Distillation and rain water.Reverse osmosis.Template assisted crystallization.
There are a number of pros and cons about softened water to consider:PRO: Reduces the hardness of the water, which can have several benefits for consumers, including: Less soap and detergents needed.PRO: Only removes the minerals that cause hardness.PRO: Reduces scaling and lime deposit build-up.More CONs: