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A pool Calcium Hardness Reducer chemical is available from most pool supply companies to lower the hardness to the desired range for your pool. You may also partially drain and refill a swimming pool with fresh water, which has a lower concentration of Calcium.

Calcium is present in the water used to fill the pool and in the pool chemicals used to treat the water. The pool chemical that adds the most calcium to pool water is standard chlorine pool shock. If you find that your calcium hardness level is too high, read the label of the pool shock you?ve been using and you will likely find that the active ingredient is calcium hypochlorite. Each time this pool shock is added to the pool water, calcium is added to the water. To prevent this problem begin using Chlorine-Free Pool Shock on a regular basis, instead of standard chlorine pool shock (Calcium Hypochlorite). The active ingredient in chlorine-free pool shock is Potassium Monopersulfate, which does the same job of oxidizing bacteria and harmful organics but does not contain any calcium.
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