Automatic Top-Off

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Part Number: EL-ATO

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Description
Owners Manual

Ultimate ATO System with Triple-Redundancy Flood Protection

Never worry about aquarium floods or salinity swings again with our professional-grade Automatic Top Off (ATO) System. Specifically engineered for demanding reef aquariums and saltwater mixing stations, this system completely automates your freshwater replenishment directly from your RO/DI unit. Unlike standard, risky top-off units, this system uses an advanced horizontal finger float sensor. This rugged, hinged design is highly resistant to heavy mineral deposits and salt creep, ensuring it will never jam or fail in harsh marine environments. It offers ultimate installation flexibility, allowing you to drill and mount it directly through the side wall of your reservoir or hang it securely over the rim of your sump using the included AquaFX adjustable bracket.

What sets this ATO system apart is its military-grade triple-redundancy safety protocol, designed to give you absolute peace of mind against catastrophic overflows:

Layer 1 (The Primary Gatekeeper): Water flows directly from your RO/DI system through an electronic magnetic solenoid valve. This valve is instantly triggered by the horizontal finger float sensor as soon as your water level drops below your target line.
Layer 2 (The Electronic Timer Backup): For maximum safety, the electronic solenoid will not turn on—even if the finger float calls for water—until our integrated digital system timer activates the circuit during designated, safe top-off windows. This stops a stuck open sensor from running continuously.
Layer 3 (The Mechanical Emergency Stop): In the absolute worst-case scenario where both the primary sensor and the electronic timer fail simultaneously, a heavy-duty mechanical wing-nut float valve acts as a physical barrier. It will mechanically lock down and catch the rising water, completely sealing the line until you are able to get there.

Form meets function with the ultimate fail-safe. Safely connect your RO/DI line directly to your sump or reservoir and enjoy a perfectly stable, automated aquarium today.