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Heavy Water :- Water in which the hydrogen in the molecules as partly or wholly replaced by the isotope deuterium, used especially as a moderator in nuclear reactors.

Hard Water :-  Water that has high mineral contentHard water is formed when water percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.

Soft Water :- Water which has relatively low concentration of calcium carbonate and other ions. The water that lathers with soap easily is called soft water.