Solaxx SALRET20A Saltron Retro Retrofit Drop-in Salt Chlorine Generator with Timer for Pools, 20000-Gallon Garden, Lawn, Supply, Maintenance Handles Pools up to 20,000 Gallons Easy Installation on New and Existing Pools - No Plumbing Required Helps Maintain Constant Sanitizer Level Programmable Digital Timer Mere 3,000 ppm Salt to Operate