In some are in Bangladesh Water Softener Plant (WSP) is mandatory for many industry due to highly hard water. Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water is more compatible with soap and extends the lifetime of plumbing. Water softening is usually achieved using lime softening or ion-exchange resins. Hard water leads to the buildup of lime scale, which can foul plumbing, and promote galvanic corrosion.In industrial scale water softening plants, the effluent flow from the re-generation process can precipitate scale that can interfere with sewage systems.