Pool Calcium Hardness Guide — How to Adjust Water Hardness | PoolDose

Complete guide to pool calcium hardness. Learn the ideal range (200-400 ppm), how to raise calcium hardness with calcium chloride, and prevent pool damage.

How to Use the Calcium Hardness Calculator

Enter current and target calcium hardness levels to calculate the required calcium chloride dose. The ideal range is 200-400 ppm.

Low calcium hardness makes water corrosive, damaging plaster, metal, and equipment. High calcium hardness causes scaling on pool surfaces and equipment.

Calcium chloride generates heat when dissolving — dissolve it in a bucket of water before adding to the pool. Add in multiple doses if raising by more than 100 ppm.