Chemistry Ways to Remove Hardness 1. By the Na2CO3(aq) (soda water) – CaSO4(aq) + Na2CO3(aq) → Na2SO4(aq) + Ca2CO3(s) 2. By the use of ion exchange resin 3. By the use of permutit or zeolite. ← Previous Temporary Hardness and Permanent Hardness Next → Advantages of Hard Water Leave a comment Cancel replyYou must be logged in to post a comment.