GLB Pool & Spa Products 71680 1-Quart Cell Saver Use 30 ounce per 20, 000 gallon water, if it contains more than 400 ppm calcium or 0.1 ppm copper or iron, add 32-ounce per 10, 000-gallon water Add required amount to a pail filled with water distribute mixture around the perimeter of the pool; this item is not for sale in Catalina island Maintenance dosage: use 8-ounce per 20, 000-gallon of pool water weekly for best results; distribute mixture around perimeter of pool Cell saver should be used as part of your maintenance program Measures 9.8-inches in length by 3.1-inches in width by 3.1-inches in height