Pool Choice Metal Free Pool Chemicals, 4 Quart, (4 Pack)

Pool Choice Metal Free Pool Chemicals, 4 Quart, (4 Pack) Prevents discoloration of pool water caused by iron, calcium, manganese, copper, and other metals and minerals Acts as a general-purpose sequestrant, protecting plumbing and pool walls from rust, stains, and scale Ideal for use during pool openings, closings, and throughout the swimming season as needed For initial filling, add one quart of Metal Free for every 10,000 gallons of pool water if metallic contaminants are suspected To correct existing colored water issues, close the pool to swimmers and run the filter pump