*BEST SELLING ITEM!* Jack's Magic Salt Solution, "The Purple Stuff" is designed to meet the demand that salt chlorine generators and high TDS (total dissolved solids) put on a sequestering agent. In addition to removing metals from the water, The Purple Stuff also helps to keep silica in solution and helps prevent scaling of the cells in salt chlorine generators. Initial Dosage: Add one quart (32 oz.) per 10,000 gallons of pool water. In problem water areas, two quarts is recommended. Maintenance levels for The Purple Stuff are 10 - 12 ppm. To determine the amount of The Purple Stuff to add to achieve this level, have pool water tested weekly with a Jack's Magic Sequest Test kit. If a Sequest Test is not available, an estimated dosage of 6 - 8 oz. of The Purple Stuff per 10,000 gallons of pool water may be added. Please keep in mind that this is strictly an estimate and the only way to accurately determine the appropriate dosage is to have it tested.