XP Aqua Duetto Dual-Sensor Complete Aquarium Auto Top Off ATO

This thing is amazing. It’s so compact and so simple to install. I installed in in 30 minutes including the time it took to drill and plumb the hose into my “reservoir” to make it as clean as I could. The sensors are very sensitive to water level, which is great because the failsafe will stop on the dime. It’s also great that it gives audible alerts to the reservoir being empty, or there being a blockage, etc. Apparently it also has a feature that will detect when the pump has been on too long and it will turn it off. The hose is nice and durable, the controller is idiot-proof, and the system is sharp. Overall, don’t go spending hundreds on an ATO when this one is perfect for a fraction of the money!

I haven't had any problems with the operation of the unit. I have a 15 gallon reef tank (no sump) and this units water level sensor is very small and discrete. I am tired of topping off manually but I needed something small and good looking to fit inside the display. For reference, I have included a picture of the sensor next to my HOB aquaclear 50. So far so good with this ATO.

This little unit is a great little auto top off for any aquarium. It is very simple to set up and it works great. I run this on all three of my tanks and haven't had a single issue with them. Will use these on future tanks.

I own two of these on two different size tanks. Simply put, they work. It takes the guess work out of my top-off. I've put hundreds of gallons through them and neither has quit. Everyone knows stability is key in reef keeping. This makes saline stability as stable as you can in terms of top-off. Setup couldn't be easier.

I've been using this ATO for 2 years. Took two years for the pump to go bad, and my tank loses about half a gallon to evaporation every day, so it runs a decent amount. Sensor is still good. The annoying bit is that the port for the pump is a non-standard size and VERY hard to find pumps that fit into it. I've even tried to get various adapters or wire my own plugs and even when they fit the ID and OD of female port on the device, the plug will be too short to fit in. Extremely annoying and bad design that seems intended to make you buy their pumps.