Swimming Pool Glossary: Soft Water
Just as water can be hard, it can also be soft. If your water is soft this means that it has very low magnesium and calcium levels, usually around 100 ppm. A lot of houses have their own water softeners but water that has already been softened shouldn't be used in swimming pools. If your water is normally soft, add some calcium chloride to it. Typically, your pool water should have between 150 and 200 ppm of calcium and magnesium.
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