softener is packed with high polystyrene base resin in sodium form.During service period polystyrene base resins in sodium from adsorb calcium, magnesium in raw water and after producing certain amount of soft water these are exhausted.these then require regeneration with 5 to 10% common salt solution.in case of big units, saturated salt solution is prepared in a R.C.C tank and required amount of brine is drawn in a brine measuring tank.The brine soln. is then diluted with the help of an injector and fed into the softener.in case of small size softener, salt is dumped inside the Excess brine is then drained during the period of rinsing with fitered water.soft water is then tested with the help of a Hardness Test kit and fed into different processes.A water Meter is incorporated on the line for measuring total amount of soft water treated by the softening unit. in case raw water contains iron more then 0.3 ppm as fe, an iron removal filter must be installed before a softener.this is to avoid iron fouling of lon Exchange Resin in softener. capacity:50- 50000 gallon per hour and above