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    Is it normal to need more chlorine every day? Is it safe for chlorine to drop to 0?

    My pool looks great other than leaves that are still dropping from the tree behind it. I opened it last week. At first, it was clear but had some grey muck on the liner and a few leaves that had fallen in over the winter. I shocked it at night with 5 gallons of liquid chlorine (12.5%) and the...