^The TUNZE® RO Water Controller 8555 is an automatic top-off control system for TUNZE® RO reverse osmosis systems ^or any type of reverse osmosis system with a pure water tank. It consists of a controller, two sensors, a solenoid valve, and a 12V power supply. To control a mains-powered unit, the solenoid valve can be replaced with the 3150.110 controlled plug.
Controlled tank draining is also possible by simply reversing the position of the RO Water Controller sensors and using the controlled plug. By combining two RO Water Controller units, an automated water exchange system can be implemented.