ChlorKing’s unique TDS controller monitors your pool water 24/7/365. Once TDS elevates to a maximum pre-determined set point, the controller simply opens an actuated valve and allows pool water to drain. This simple and elegant solution helps pool operators that are using bleach or chlorine generators to maintain TDS at a level that they are comfortable with. Forget having to manually drain your pool or spa during the course of the year, when our TDS controller can do it automatically each day, month, or as needed.