Intex QS500 Krystal Clear Saltwater System eliminates bacteria and algae from pool water using virtually undetectable amounts of economical, eco-friendly salt. This system produces low levels of natural chlorine that swimmers neither feel nor smell. The result is soft, fresh, clean water without the potential harsh side effects of packaged pool chemicals. It is designed for water purification in frame and inflatable pools. It fights the formation of mucus, moss on the walls and bottom of the pool, and also helps to keep the water from the multiplication of microbes and green ooze. It has redesigned control panel with display and easy access buttons. Requires a filter pump with a flow rate between 700-3000 gph (2650-11355l/hr). Chlorine output: 5 g/hr.