Chemical treatment:Chlorination levels in the range of 1 to 2 parts per million (ppm) should be maintained as a minimum. Occasional super chlorination or shock treatment with an algaecide may be required for algae control. Other chemicals may have to be added to mitigate concentration of minerals, particularly calcium and iron. The need for any treatment beyond the maintenance of chlorine residual is generally empirically determined and should be administered only after consultation with water treatment specialists and consideration of its compatibility with pool piping, hardware, and finishes and with governmental standards regulating overflow or effluents from the drain systems
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