Tunze ATO Auto Top Off 3155 Osmolator

The Tunze ATO 3155 Osmolator is a high-tech automatic top-off system designed to maintain a reliable water level in your aquarium. Sensitive aquarium inhabitants rely on stable osmotic pressure, and the Osmolator ensures this with precision and safety. Easy to install, this compact unit combines all essential functions, providing continuous monitoring and refill of aquarium water. The system features a low-voltage pump, mounting magnets, tubing controller, and power supply—requiring only a reservoir and water to operate. The Controller 5017 displays functions optically and sounds an alarm in case of any issues.

Redundant safety measures include a proprietary optical main sensor, a backup float switch that shuts off the unit and sounds an alarm, and a safety circuit that stops the pump after 10 minutes if all else fails. Its optical mini sensor allows precise water level detection, and the included magnet holder makes mounting simple and secure.