Tunze Osmolator Auto Top Off System


In 1985 Tunze invented the automatic refill system for aquariums. The Osmolator is very easy to install and provides its complete functionality in a single compact unit. Only the Osmolator is able to provide you with the necessary security and reliability, since it is based on the vast experience that Tunze has been able to gather throughout the course of many years.  The Osmolator Universal 3155 is our recommended top off model.  While more expensive then alternatives, it is worth the extra cost for it’s reliability.


  • Optical mini senor recognizes the water level precisely
  • Water level controller which displays all functions optically and sounds an alarm in case of failures
  • Magnetic sensor mount
  • Redundant security: the main sensor is a proprietary optic sensor. Should that fail a safety float switch shuts the unit off and sounds an alarm. Even if that fails safety circuitry shuts off the pump after 10 minutes.

Product Manual

Additional information

Weight 5 lbs


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