https://studyandupdates.in/the-process-of-removing-calcium-and-magnesium-from-hard-water-is-known-as-%e0%a4%95%e0%a4%a0%e0%a5%8b%e0%a4%b0-%e0%a4%9c%e0%a4%b2-%e0%a4%b8%e0%a5%87-%e0%a4%95%e0%a5%88%e0%a4%b2%e0%a5%8d%e0%a4%b6/