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Hard Water is very dangerous to health of human beings. It causes many diseases in humans. It also disturbs the industries. It is not safe to drink, also for other domestic purposes. The hardness in water is caused by polyvalent metallic ions from sedimentary rocks, seepage and runoff from soils. Calcium and magnesium, the two principal ions, are present in many sedimentary rocks, are the principal ions causing Water Hardness. They are also common essential mineral constituents of food. Excessdoi:10.13188/2380-5021.1000009 fatcat:zljxbu6h2rbsfp2gys5ihr5leq