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See also: Water softening. Soft water is surface water that contains low concentrations of ions and in particular is low in ions of calcium and magnesium. Soft water naturally occurs where rainfall and the drainage basin of rivers are formed of hard, impervious and calcium poor rocks.ecause soft water has few calcium ions, there is no inhibition of the action of soaps and no soap scum is formed in normal washing. Similarly, soft water produces no calcium deposits in water heating systems. Water that is not soft is referred to as hard water.
(Soft water is pure water.) This builds up over time and eventually the water flow is blocked off and the item no longer functions correctly. A water descaler dissolves the calcium or magnesium which has built up.The calcium or magnesium is absorbed from the ground into the water supply so whether you have hard or soft water is dependant on the ground where you live.cale is the solid layer that is deposited on the surfaces inside pipes, boilers, heaters etc. Chemically, scale is combination of water insoluble salts of Calcium and Magnesium-CaCO3 (limescale) and MgCO3.