Water chemistry
Calcium hypochlorite
Calcium hypochlorite, or cal-hypo, is a granular chlorine that adds calcium to the water.
Cal-hypo is a strong, fast shock. It does not add stabilizer, which is a plus. It does add calcium, which can build up over time and cause scale, especially in hot North Texas summers.
It is also a strong oxidizer. Keep it dry, stored away from acids, other chlorines, and anything that can burn. Never mix it with other products. Pre-dissolve it in a bucket of pool water only if the label says to, and add it at dusk with the pump on. If your hardness is already high, pick liquid chlorine instead.
Related terms
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