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The Blue Stuff™ proprietary blend helps to remove copper from the water. It is also very stable in higher chlorine levels and can be used in many fountain and water feature applications. Initial dose (for existing pools): one quart (32 oz.) per 10,000 gallons of pool water. In more harmful water areas, two quarts are recommended. Maintenance/Preventative Maintenance levels for The Blue Stuff are 10 - 12 ppm. To determine the amount to add to achieve this level, have pool water tested on a weekly basis.