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!

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.

Very satisfied. Half the cost of Tunze, and works great. Some other reviews mentioned 10 second shut off time being an issue causing over filling . This is an ATO that should be set up to a very low GPH pump. The 10 second time is not an issue at all. The pump included works great. The timed safety feature works as advertised. You can spend twice as much and get the Tunze with the float valve back-up, but for the value, this is great.

Its plug and play. Very easy to use. My only complaint is that the tubing holder does NOT work for standard size rimmed tanks. On the manual it states "For rimmed or rimless aquariums up to 1/2 inch (12.7 mm)". Luckily I was able to just attach it to my HOB refugium's wall, hose angled to the display tank. So it wasn't a big issue for me.

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.

This was easy to install and worked well for 9 months. Then one morning after a tank cleaning it flashed blue and orange and would not work again. I tried everything recommended in the instructions to remedy the situation and nothing worked. Very disappointed that it didn’t last longer for the price. I ordered the AutoAqua Smart ATO to replace it and it has the exact same pump and power adapter for a much lower price on Amazon.

I have had this on my take for only 1 week so far, but I love it already. I have a 10 gallon tank for reservoir, and this system is on my 90 gallon frag tank. It took maybe 5 mins to install and plug in. It mounts nice to stand or wall with screws (not supplied) maybe a heavy duty Velcro would work as well. It does have an “alarm” on it. If it senses a problem the alarm will go off. I’ve had it go off once and it was because of air bubbles built up against the sensor. Cleared those and it went right back to working. The mounting bracket will not work if you have a rimmed tank I’m afraid. It’s much smaller than I expected and I mounted it on a single pane of glass in my sump. As of right now, I would recommend. I don’t foresee any future issues but will do my best to update this review if I ever encounter them.

Amazingly easy to install, and has been incredibly accurate so far. Cost wise, it’s right in the middle of automatic top off devices, but it seems to be off very good quality, and so far it works perfectly. So much more convenient than constantly having to worry about filling the evaporated water in an aquarium.