Saltron Retro is a salt chlorine generator for in-ground and above ground swimming pools up to 20,000 gallons that requires no plumbing or electrical contracting work to install. Perfect for after-market installation! This self-contained purification system utilizes a natural process to generate pure chlorine. The electrolytic process uses a very low concentration of salt (less then a teaspoon per gallon) and generates free chlorine. The chlorine continuously kills bacteria and algae and then reverts back to salt. This indefinite cycle leaves the water feeling silky, soft, refreshing and sparkling clear. Saltron is easy to install, economical and fully automatic. No more purchasing, transportation or storage of chlorine. No more skin irritations and itchy red eyes. No more faded bathing suits.Saltron Retro includes a programmable digital timer to adjust chlorine output and LED indicator lights illuminate for easy salt level reference.The commercial grade titanium cell plates reverse polarity keeps cell clean and prevents scaling. The clear salt cell housing allows user to easily inspect cell for scaling.Switch-mode power supply provides smooth current to cell resulting in longer lifetime. Saltron systems work on a salt level to 3,000 ppm.