D-D Advanced ATO (Automatic Top-Up Unit)
The D-D Advanced ATO maintains the water level in your aquarium, automatically replenishing water lost through evaporation. Its main optical sensor has three detection points allowing the unit to not only control the water level at a set point but also to recognise if the water level is below or above normal, triggering an audio and visual alarm. In addition to the main optical sensor, a failsafe ‘Anti Overflow’ float sensor is included that will shut down the ATO function and set off an alert when triggered.
An included auxiliary leak detector sensor can also be connected to the ATO and placed next to the sump or the aquarium, alerting if any water is detected as a result of a leak or water spillage.
Key Features
- Smart ATO low voltage controller
| Feature | Description |
|---|---|
| Main Optical Sensor | Three detection points for accurate water level monitoring and alarm when level is below or above set point |
| Anti Overflow Float Sensor | Failsafe mechanism that shuts down ATO and triggers alert if overflow is detected |
| Leak Detector Sensor | Optional auxiliary sensor to detect leaks or spills near sump or aquarium |
FAQ
Can the ATO detect both low and high water levels?
Yes, the main optical sensor has three detection points and can detect if the water level is below or above the set point, triggering an audio and visual alarm in either case.
Is the Anti Overflow sensor automatic or manual?
The Anti Overflow float sensor is automatic and will shut down the ATO function and trigger an alert when overflow is detected.
Can I connect a leak detector sensor to the ATO?
Yes, an auxiliary leak detector sensor is included and can be connected to the ATO to monitor for leaks or spills near the sump or aquarium.



Austin Glover –
The ATO has been running smoothly for three months. It maintains the water level perfectly and alerts me when the level drops or rises unexpectedly. The leak detector is a great addition for my sump setup. No issues with overflow or false alarms so far.
Kylie Davies –
Works well for my 120-gallon tank. The optical sensor is reliable and the alarm system is effective. I noticed the anti-overflow sensor triggered once during a heavy rain, which was helpful. Would like to see a mobile app for monitoring.
Sean Vaughan –
Easy to install and very responsive. The three-point sensor gives accurate readings and the visual alarm is clear. I use the leak detector next to my sump and it caught a small spill early. Highly recommend for any aquarium keeper.