Giant Pacific ReeFill Optical ATO - Osmoregulator for Aquarium

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Giant Pacific ReeFill ATO is a reliable Auto Top Off unit for aquariums with a Patented Optical Sensor and Overfill Protection. It automatically monitors and replenishes evaporated water to your aquarium. ReeFill ATO is easy to install and comes complete with pump, hose, bracket and power supply.

The Giant Pacific ReeFill ATO automatically replenishes water lost due to evaporation when the level drops below the minimum sensor. The controller activates the pump to refill from an external water reservoir and automatically switched off once the required level is achieves, maintaining your aquarium water level.


  1. Mount the ATO sensor in the sump with the sensor position at the water level required.
  2. Connect the pump to the controller and place it in the top up water reservoir.
  3. Connect the water hose to the pump and install it to the sump using the supplied slip.
  4. Connect the power supply to the pump and test functionality by sliding the sensor upwards until the pump activates, then sliding down again to test that the pump switches off.

Pump Performance:

  • 200l/h Flow Rate
  • 1.8m Head Max


  • 12 Volt
  • Universal
  • Optical Sensor
  • Magnetic Mount - Up to 12mm glass thickness
  • Overall Protection 
  • Slim


  • Item No: GP-ReeFill
  • Barcode: GP-ReeFill
  • Weight: 
  • Warranty: 1 year guarantee
  • Dimensions:
  • Suitability: Universal
  • Type: Autofill 
  • Mounting: Magnetic up to 12mm 

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