Question

What is the cause of tube-well water being hard? How this water can be softened?​

Answer 1

Answer:

This water has dissolved impurities and minerals including calcium and magnesium. When levels of dissolved impurities (TDS) are higher than recommended levels, and the Calcium and Magnesium in particular are high, water is termed as “Hard Water”.

Water is softened when calcium and magnesium—the hardness ions—are collected by tiny resin beads through a process called ion exchange. ... When hard water comes in contact with the resin beads, the calcium and magnesium are pulled out of the water and replaced with sodium or potassium, leaving your water soft.