Water softening plants working with ion exchangers replace calcium and magnesium ions forming scale by neutral sodium ions and thus soften the water to the desired degree of hardness. In the drinking water area the water is softened to about 7-8°dH.
For industrial applications, e.g. as boiler feed water, water always is softened to 0°dH (dH = deutsche Härte, German measuring unit for hardness). In this case a technical design as duplex water softening plant is absolutely required for continuous and trouble-free operation of connected plants.
Regeneration of the ion exchange resin working in the plant is made automatically corresponding to the capacity used. The capacity of a plant is calculated by the water hardness and the quantity of water treated.
