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Home > School Of Pool > What Is Calcium Hardness?

It's the amount of dissolved calcium in the water. Keeping CH at the proper range will help protect equipment and keep water sparkling. It also helps prevent cloudy water.

Ideal range 175 to 225 ppm (200 to 275 ppm for plaster)
If it's too low, use Calcium Increaser
If it's too high, use Scale Free
If over 400 ppm, it may be necessary to partially drain the pool and add source water with lower CH.