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

This was easy to set up. It is small and discreet. It has stabilized the water level and appears to work as expected. The sensor does what it was created to do. So far, so good! And the price point is perfect.

Works great and keeps the water level stable automatically. Setup was straightforward and it runs reliably without issues. Saves me time and makes tank maintenance much easier. Good for both saltwater and freshwater setups. Easy of use.

I've now purchased 3 times. All 3 of these are absolutely garbage. They work for ruffly 1 to 6 months and then ultimately fail. Reviews say it's great, but notice none of the reviews mention "Years of use". Longevity wise, this gets 1 out of 10. Waste of money. The pump is a 2 out of 10. It's slow, small and breaks easily. It's the kind of pump you'd expect to pay about $1 for. The sensors are NOT water proof and in fact the sensors will take in water and then create a film inside that destroys the sensor. All in all, this is an epic waste of money. Amazon should be ashamed to sell this product, as it's designed to break and you will need to replace it again and again and again. Quite frankly, I'd like my cash back. This is a scam product in which I have 3 of. 3 is enough to prove a point. If the seller or anyone at Amazon would care to interject, maybe we could establish some accountability. For this product, there is none. Buyer beware. This is a disposable product with a shirt lifespan. Absolutely rubbish.

Honestly one of the best purchases I’ve made for my aquarium, although I don’t use it for its intended purpose. I use if for water changes, putting the pump in my aquarium with the sensor off to the side, and the water goes into a bucket, and for refilling I unplug the sensor, move the pump to the bucket of new water, put the sensor in my aquarium as indicated in the instructions, and then plug the sensor back in. It is so, so, so much easier than getting my siphon started, stresses my fish out WAY less, and creates way less of a mess too. It obviously doesn’t work for vacuuming gravel, but it’s made maintenance on my aquarium so much less stressful, and freed up a decent chunk of time too.

Works as intended, and is great for the price. It only failed me once and of course it was while I was away for a week. It lasted 2 years and the salt creep broke the seal on the optical sensor and water got in. Fried the sensor. But for $40, Id say it exceeded my expectations. I wouldnt use this on my big tank with expensive stuff, but a smaller tank is perfect! I will just buy a replacement and maybe try to reinforce the seals on the new one. If only they sold the sensor separately

Easy to set up and works great. It keeps my tank’s water level right and the pump is quiet. Everything feels well made and seems reliable. Definitely a nice upgrade from doing the top offs by hand.

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.

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. 😊

Setting up a small reef tank in my living room, evaporation was disrupting my salinity stability, I'd lose 1-2 cups a day in summer. Picked up this ATO system and it's been running flawlessly for over a month now. It uses dual optical sensors, very accurate, no false triggers from waves or bubbles. When evaporation drops the level, the quiet submersible pump kicks in and slowly adds fresh RO/DI from my 5-gallon reservoir bucket (not included, but easy to connect with tubing). It adds the right amount in short bursts, keeping parameters steady, salinity holds at 1.025-1.026 without fluctuation. Installation was straightforward, mount the sensor bracket in the sump, drop the pump in the reservoir, route the tubing, plug in, and calibrate if needed. Pump is very quiet, no vibrations, and the whole system feels well-built for the with sturdy tubing and good connectors. No leaks after setup, highly recommend!

Ha funcionado muy bien

I bought this ATO for my nano saltwater aquarium and would not buy again. It failed twice in about 4-5 months. The magnet is not strong enough so any large turbo snail can push the sensor up, making the water level go up. Also, the glow of the light is annoying at night. Pay more money now for a good ATO with a strong magnet and a cover over the light sensor

Excelente producto muy buena precisión y fácil de instalar

Muy bueno el producto comple perfectamente con lo especificado