Giant Pacific Reefill ATO Auto Top Off System for Saltwater Aquariums – Perfect for Coral Tanks & Marine Fish Keeping

The Giant Pacific ReeFill ATO Osmoregulator is designed to work with aquariums of all sizes, from pico desktops and All-in-One aquariums with limited space, to large reef tanks with full sumps. The ReeFill ATO Osmoregulator has 3 sensors and registers your water level in a fraction of a second. It's small platform allows it to be installed unobtrusively almost anywhere!

Fully Self-Contained.
The Giant Pacific ReeFill ATO Osmoregulator is fully self-contained, meaning the controller and sensors are all contained in one small central unit. There is one plug for power in, and another plug for power out to the pump (included). That's it. No more controllers to mount in your aquarium stand.

Three Water Level Sensors Onboard.
Every ReeFill ATO Osmoregulator includes 3 sensors to determine your aquariums water level.