Keep your tank’s water level stable and your salinity in check with our Dual Optical Auto Top-Off (ATO) System. Designed for simplicity and safety, this compact unit automatically replenishes evaporated water before it affects your tank’s balance.

Features:

Dual Optical Sensors – Maintains precise water levels and prevents overflow with dual-stage detection.

Battery Powered / No Controller Needed – Simple setup with no circuit boards or complex wiring.

Safe for Freshwater or Saltwater Tanks – Perfect for nano, mid-size, and reef setups.

Easy Installation – Mounts securely on tank or sump edge with included hardware.

Overflow Prevention Design – Automatically shuts off when full to prevent flooding.

Ideal For:

Hobbyists wanting affordable automation.

Smaller reef or freshwater aquariums (up to ~75 gallons recommended).

Backup or portable ATO option for maintenance setups.