calcs.homes
calcs.homes
Calcium chloride raises calcium hardness, protecting plaster and equipment from corrosive, low-calcium water. Enter your current and target reading for an exact dose.
Estimate only — pre-dissolve in a bucket of water before adding to avoid clouding.
About 1.25 lb of calcium chloride (77% flake) per 10,000 gallons raises calcium hardness by 10 ppm. Low calcium hardness makes water aggressive toward plaster and metal fittings, pulling calcium out of surfaces to compensate — the opposite problem of scale buildup from too-high hardness.
200-400 ppm for plaster pools; vinyl and fiberglass pools can run lower, around 150-250 ppm, since they aren't affected by calcium etching the same way.
Adding it directly and quickly can cause a temporary cloudy reaction. Pre-dissolve it in a bucket of water first, then pour the solution around the pool edge.