Sodium Bisulfate - pH Down - 50 Lb. Bag filter-width_7 inches It is necessary that a

It is necessary that a uniform distribution of this product be spread throughout the pool for maximum effectiveness

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Sodium Bisulfate - pH Down - 50 Lb. Bag filter-width_7 inches It is necessary that aThis is a 50 pound bag of Sodium Bisulfate, also known as pH Down. This product lowers pH to an ideal level for swimming and recreation. Helps to prevent eye irritation, cloudy water, and scaling caused by high pH. It also helps chlorine fight bacteria and control algae which keeps your pool looking clear.