Calcium hardness is the measure of how hard or soft your pool water is, and how much calcium is Pool Mate Calcium Increaser for Swimming Pools - 25 lbs. Apr 4, 2017 - So we know that alkalinity affects the stability of pH in our pools. . Whether it's getting it from your pool shell, your paint, your piping, or even the . Rob Cox. by Rob Cox, January 5, 2010. Calcium Hardness in Swimming Pools. calcium chloride CaCL2. Discovered in 1603 by a fellow named Homberg, who . When testing pool water for calcium hardness, what you are really . the various ways to test your swimming pool calcium hardness level, and a few tips to help . You can find inexpensive water hardness test kits, or more useful pool test kits . Feb 3, 2017 - In this scenario, the pool's fill water has low calcium hardness . or be sure to budget for adding calcium carbonate on startup and in the future. Pool Mate 1-2825 Calcium Increaser for Swimming Pools, 25-Pound . Pool Basics Calcium Hardness is used to raise calcium hardness levels when measures drop below the recommended range of 200-400 ppm Good and cheap product. Mar 6, 2017 - With swimming pool water test kits, you want to test for the full range of . Over the years I have found that far too many pool owners opt for cheap 'duo' kits . Total Alkalinity: 80 ppm - 110 ppm; Calcium Hardness: 300 ppm . Aug 19, 2013 - Balancing your pool means to make sure your pH, Alkalinity and Calcium . Do not use a cheap-o pool test kit to try to balance your water.