About Products : Calcium and magnesium dissolved in water are the two most common minerals that make water "hard." The simple definition of water hardness is the total amount of dissolved calcium and magnesium in the water. Hard water creates operational difficulties with boilers, cooling plants heat exchangers or in domestic use of water. Also hardness in process water is a critical parameter in many chemical processes. Whenever heat transfer takes place, with water as medium, hard water creates scaling on heating surfaces making heat-transfer progressively inefficient. Daily monitoring & control of water hardness at such places is important, as it can cause inefficient operation/failure of such equipment.