Elos Osmocontroller Digital - automatically tops off the aquarium from evaporation.

The OSMOCONTROLLER Digital uses a patent pending sensor with no moving parts.

To provide an adequate fail-safe the OSMOCONTROLLER Digital uses a small microprocessor in combination with Elos's patent pending sensor to control the pump and monitor the top off of your system. The OSMOCONTROLLER Digital also has a manual top off button that can be used to use the system as a pump for occasional water changes and to fill a container with RO/DI water easily.

The set up of the OSMOCONTROLLER Digital is very simple. It works with most sumps without the need for programming.  The sensor design has a built in buffer for waves and small changes in the sump that will normally cause a top off system to unnecessarily top off, which will shorten the useable life of the top off pump. Ideal for MINI and MIDI reef aquariums where a small modification of the water level MUST be avoided to keep the salinity consistant.


  • No moving parts
  • Very easy setup. (System runs a 5 minutes self-diagnostic test when it is first plugged in.)
  • Maintains a very accurate level, very important in marine systems for a stable salinity level when keeping delicate animals.
  • Adapts to most aquarium/sump sizes automatically.
  • Requires 3/8" tubing, which is not included