ChlorMaker CHLORMAKER Portable Pool Salt Chlorine Generator 110/220V is a semi-automated, saltwater chlorine generation system specifically designed for spas up to 1,000 gallons. Turn your hot tub water into saltwater by adding a small amount of ordinary salt (about a teaspoon per gallon), and then let the chlorine generator take care of your sanitation needs day after day. The cell simply drapes over the side of the spa into the water and the spa doesn’t even have to be on when the ChlorMaker is making chlorine. This system makes it easy to control chlorine production and shut down the system if there's ever too much salt.