Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue

I would like to start of buy saying I have been in the aquarium hobbies for over a decade and had always taken steps to reduce evaporation as much as reasonably possible. However after many years of topping off my tanks manually I decided to look in to an ATO, after reading many reviews and seeing a few videos I settled on this one and I'm glad I did. The ATO is very simple to to set up in just a few minutes. The sensor that goes inside of your aquarium is very small and the magnet used to secure it in place feels adequately strong enough that I'm not worried about it falling inside of my aquarium. I purchased a smallish 7 gallon water container one would use for camping to use as a reservoir for hold additional water and the small pump head fits very nicely inside. So far it has been working great. There is very and I mean very little noise heard from the pump when it kicks into action and the only time I've heard it was when everything in the room is shut off and its stone silent in the room. The only draw back that I can think that may throw some people off is the sensor it's self is a very very bright night light so best not to use in a bedroom I'd say if you like the dark that is but seeing as the aquariums in question are located in my home office / game room it doesn't bother my in the least. I have plugged my ATO into a smart plug to make water changes and gravel vacuuming easier as I can disable it while doing so. Hopefully people find this review helpful. 😊

Lasted me a good 3 years just recently the motor gave out But I’m partly to blame since I had run the motor dry a couple of times. Just bought again to replace the parts. Does the job well

a 30-day replacement policy seems appropriate. I purchased on February 15 and had it up and running probably a week after it arrived. Easy set up, and it works. A little noisy, but not horribly. Now it's the first week of May and it no longer works. Sensor seems to be dead, for all I know the pump is still OK but there's no way to tell. So I got a little over 3 months out of it and now I have to find something else.

Maintaining the right water level in an aquarium is crucial, and this ATO makes it simple. Every aquarium loses water to evaporation, but in saltwater setups, that also means salinity levels start to climb. This system takes the guesswork out by automatically topping off the water, keeping both the level and salinity stable so fish and corals thrive.The design is compact and sleek—just 0.7 inches in diameter—so it doesn’t take away from the beauty of the tank. Setup was straightforward, with all the parts included, and it fits perfectly in rimmed or rimless tanks.I really appreciate the safety features. The QST protection gives peace of mind by monitoring refill times and preventing overfilling or pump damage if something goes wrong.Overall, this is a practical, space-saving, and reliable solution for anyone with an aquarium. It’s not just convenient—it’s a must-have for maintaining a healthy aquatic environment.

Although at first it flooded my floor twice, and dropped my salinity, I have it a third chance and now is working like a charm, dunno what changed

I’ve heard about these cheaper ATO’s overflowing their tank. This one works great and the good news is you will never have this issue if you just turn it on the 1-2 mins/day. It quickly finds the height of the water and kicks on/ into standby accordingly. I have this installed into a 5gal bucket with holes for the check valve and power cord. It lasts me for weeks with a 55g reef tank with lids on. And with a check valve the pump doesn’t get taxed much and should last for a while. The box did arrive wet/ and slightly damaged, but the product was fine. The device’s magnet is strong and holds through about a 1/4” with a very strong grip. The pictures are accurate. Device is about the width of a nickel’s diameter.

I don't want to completely diminish this product. It's not hard to assemble or use. It's small and indiscreet if you can cover the light of the sensor. For the price you pay it's decent.I do worry that the sensor maybe isn't as water proof as it needs to be. It will likely stop working before a year. I have purchased two. One is still going the other has a solid red light when powered on and in place and will no longer operate. I have tried using both distilled water and 99% alcohol to clean the sensor and it has not worked. I even soaked the sensor in alcohol overnight. The only other thing I can think to try is maybe cleaning the pump. I'm pretty certain it is finished though. If you can, try to place the unit and disturb it as little as possible. I think when I removed it recently and let it dry that was what ultimately did it in.Simple set up and mechanism. Decent price and design. Poor longevity.

Working great so far. Been using this to pump water from our main tank filter to another smaller tank. Havn't had any issues yet, I'll be sure to update if needed. Nice to take advantage of our main system. I might cover the light with a sharpy later. No leaking yet.