I'd give it 6 starts if I could By Dariush on 3/19/2014
Dariush would recommend this product to a friend
All I can say is WOW. This thing is great. Setup was about as easy as it gets (Reader's Digest version below):
1. Mount sensors on bracket
2. Mount bracket to tank
3. Mount controller to stand
4. Connect tubing to pump and tank/sump
5. Connect pump to controller.
On my 20 gallon nano reef, this thing keeps the water level dead on accurate, and the default pump setting works just fine, although it is adjustable via a variable pot inside the controller.
The pump makes a slight hum while it is running, but it is hardly noticeable, and since it isn't running all the time, odds are you will never hear it.
flawless By angelo on 3/17/2014
angelo would recommend this product to a friend
works perfectly since i got it over a year ago. never an issue
Great Product By TEM on 3/17/2014
TEM would recommend this product to a friend
Best auto top off I know of. This is the second one I've purchased-for a second tank. Reliable and dependable.
Very reliable product By Nil on 3/14/2014
Nil would recommend this product to a friend
This is the most reliable aquarium products that I have ever owned. Works really well. I installed it in my sump. Maintains the level just as it promises to do. No mechanical parts in the sensor, which is great. The pump ran dry on couple of occasions due to my mistakes, I thought I killed it but it still runs. Great product.
Like a Charm By Bradley on 3/12/2014
Bradley would recommend this product to a friend
I have the smaller ato for my biocube and it works great, so I had no issues with trying this ATO for my new 90. Just set up the tank about 6 weeks ago and this thing works like a charm. Constant water levels is a foundation for keeping other levels in check.
Awesome!!! By Nick on 3/9/2014
Nick would recommend this product to a friend
I bought this ato when it was on sale for black friday and let me tell you dont waste your money on anything else. This is well worth the money and I would buy it again ovre and over. Tunze knows how to make equipment. Happy Reefing!!!
Nice ato By Ryan on 3/6/2014
Ryan would recommend this product to a friend
I've had this top off running on my tank for about 6 months now, i can say it works great but has a couple of flaws. The electronic eye can slime over somewhat easily if you don't watch it. Secondly, if the water level in your top off reservoir is higher than the outlet of the pump tube it will create a syphon and drain the whole reservoir into your sump. I've had it almost overflow twice, now i use a 5 gallon bucket on the floor which lasts about a day :( . Overall a great product, a little $$ though.
Best ato By Bryce on 2/24/2014
Bryce would recommend this product to a friend
This ato is the best one i've ever owned. Never failed!worth the extra cost!
Great Product By Jesse on 2/21/2014
Jesse would recommend this product to a friend
Easy to set up and works great
Best ATO ever By Jonathan on 2/4/2014
Jonathan would recommend this product to a friend
I was a bit put off by the price of the Tunze Osmolator ATO, but when it went on sale at Thanksgiving I went ahead and took the plunge, and I have rarely been so pleased by a piece of equipment! The instruction manual if very helpful, without much useful info lost in translation. Setup was easy, and after on minor overfill due to me not having the two sensors far enough apart, my sump level stays within about a half inch of the same point at all times. I strongly recommend that anyone considering an ATO buy this system. You get what you pay for, and in this case its the best ATO on the market.
Plays well with fish, but requires supervision By cp on 1/28/2014
cp would recommend this product to a friend
Overall this ATO works really well. It's nicely made and it was fairly easy to set up.
Four stars because the sensor got filmed over and stopped working within a week. It was easy to clean by wiping it off and then it worked fine again. The film was my fault, since I hadn't gotten the dosing dialed in the new tank, and I caused precipation by adding Ca and alk solutions to the sump. But even so, it means that the unit is not maintenance free so I will have to get my tank sitters to check the water level and will have to explain how to clean the sensor if needed. Kind of a bummer, since ease of fish-sitting was one main reason for buying this unit.
nothing but problems By Greg on 1/17/2014
Greg wouldn't recommend this product to a friend
I switched from a JBL after the hrs video, and although the pump on the unit is quiet, and moves a lot of volume, I have had nothing but problems maintaining my aquarium salinity. The Tunze will constantly over fill the tank, and the alarm will go off. If I wasn't hooked up to an apex controller, It would of destroyed the tank. I've tried all the jumper settings, and nothing seems to make a difference.
I've been fighting this for 6 weeks now, I'll be switching back this weekend.