A. Super-chlorinating is just what it sounds like: Instead of putting in 2 ½ ounces of chlorine per 10,000 gallons, you put in 5-10 times that amount. But you do it only when needed, usually after a heavy rain, a very hot weekend or when the pool’s been heavily used. Before swimming, you must wait until the free residual chlorine has returned to below 3 ppm.

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