AquaRite provides complete pool and spa sanitization using ordinary salt. It converts a small amount of salt – approximately one teaspoon per gallon of pool water – into a virtually endless supply of fresh, pure chlorine. This environmentally friendly and self-renewing process produces up to 1.45 pounds of chlorine a day. Turbo Cells are available in three sizes – 40,000, 25,000 and 15,000 gallons. The three sizes enable you to right-size your system for the most efficient and cost-effective chlorination possible. Sold Seperately. MUST PURCHASE APPROPRIATE SALT CELL FOR A COMPLETE SYSTEM