$159.00 AUD
$46.95 AUD 
Explore aquarium auto top-up (ATO) systems at The Tech Den, including options from Auto Aqua, Tunze, Red Sea, Kamoer, Giant Pacific and Neptune Systems. ATO units replenish water lost through evaporation, helping maintain a consistent water level in your aquarium or sump.
Browse Auto Aqua Smart ATO models, Tunze Osmolator and Osmolator Nano, Kamoer ATO One 2 SE, Giant Pacific ReeFill and Neptune Systems ATK V2. Compare sensor types, mounting requirements, pump specifications and included components to choose a system for your setup. The Red Sea ReefATO+ combines auto top-up, temperature monitoring and leak detection and is listed for saltwater use only.
Selected products combine automatic water changes with auto top-up, including the Kamoer X2SR and Auto Aqua Smart AWC Duo G2. Auto Aqua RO top-off and shut-off devices are designed for managing RO or RO/DI reservoir filling. Check each listing to distinguish aquarium top-up systems from reservoir controls and water-change equipment.
The collection also includes optical sensors, liquid-level sensors, leak detection equipment and related accessories. Check controller and module requirements before ordering, particularly for Neptune Systems components. Follow the manufacturer's installation instructions and confirm the product's freshwater or saltwater suitability for your aquarium.
