Piece of mind, stable salinity By Adam on 9/15/2015
Adam would recommend this product to a friend
Wow, what a great purchase. This is the way to keep your tank topped off for evaporation loss and keep salinity EXTREMELY stable. Drop dead simple with two forms of measuring water needed. Takes about 5 minutes to install and get running. This is especially helpful when I travel and have a sitter care for the tank. All they have to do for water is keep the top off jug full and everything else from a water level perspective is covered. I really love this product. This is the best solution for automated top off I have seen.
Love it By Jorsreeftank on 9/6/2015
Jorsreeftank would recommend this product to a friend
This is my third ATO system so I feel qualified to Say this is the best one. It's easy to install an what I like best is its safety redundancy and the fact that it really keeps my water where I wantbit!! It kicks the pump on as soon as the level drops. I would say less than a pint
Best ATO By Joesreeftank on 8/23/2015
Joesreeftank would recommend this product to a friend
Do not screw around with the others, This one does what it says, It keeps my Sump right were I set it, I have a 40 gal sump and if it looses less than a couple of pints it kicks on and tops off..Easy to install
Must have item By Jim on 8/11/2015
Jim would recommend this product to a friend
Great auto top of package, very easy to install and get set up. Pump is a little loud for how small it is (only hear it when in the room, which i like since I know it is working). The price is a little high, but totally worth it once you see it in person and have it setup. Would definitely buy again.
It's a Must Have By Derek on 8/10/2015
Derek would recommend this product to a friend
Hands down the best ATO, I have every owned and I can't see myself using anything other than this product. Wrongs flawlessly and most definitely it put me at ease not having to worry about adding water or flooding my sump.
Excellent ATO System By 40g Long on 7/22/2015
40g Long would recommend this product to a friend
After we finally got our tank set-up, I was amazed at the amount of evaporation from day to day. Being new to the hobby, I was concerned with maintaining stable water parameters. . I watched all the videos, researched the high tech models to the DIY versions, and decided the Tunze would be the ATO for our system. Since it's installation it has been performed flawless. I highly recommend this product.
great product By rrosenb on 7/22/2015
rrosenb would recommend this product to a friend
So easy to install and works perfectly. I wish all aquarium products could be more like this
Excellent ATO By Conny on 7/22/2015
Conny would recommend this product to a friend
Well built, easy setup, reliable- excellent ATO
Works great By Dave on 7/17/2015
Dave would recommend this product to a friend
This thing works great!! A little pricy compared to other top off brands but very dependable and unlikely to fail. I would recommend this product over all the other ones on the market. Easy to install too!
Solid and reliable By Steve on 7/16/2015
Steve would recommend this product to a friend
The Tunze 3155 Auto Top Off system is the best there is. This is my second 3155 system, just installed on my new 185 gal tank build. My first 3155 system (on my first,180 gal, tank build) continues to function perfectly, with no issues, after more than 3 years of service.
Nice simple and reliable By JEMM55 on 7/14/2015
JEMM55 would recommend this product to a friend
Better than the rest...the electric eye beats the mechanicals hands down
Loving my Tunze ATO 3155 By A.J. on 7/13/2015
A.J. would recommend this product to a friend
After a fair amount of research and reading many customer reviews I pulled the trigger and bought the 3155. Works perfect and only took a few min to set up. It really take the stress out of traveling, not having to worry about your water level. ALSO - has kept my salinity rock solid for over 3 months now, which my corals are loving!!
great customer service By dozer42 on 6/20/2015
dozer42 would recommend this product to a friend
My ato quit working. Contacted tunze and they had me send it in. Long story short my pump went bad and burned out the controller unit. I had to buy a new pump but even though my controller unit was out of warranty they replaced it for free.
Must Have By RICHARD on 6/16/2015
RICHARD would recommend this product to a friend
This works great and the two different sensors are awesome. I even plumbed this to feed my two foot tall DIY kalk reactor and it feeds the reactor with no issues.
Get it. By Michael on 6/12/2015
Michael would recommend this product to a friend
This is my first and probably the will be the last ATO system I will need to buy...unless I set up another reef tank of course. Forget about the "hefty" price tag, your tank is certainly worth it.
Excellent product! By Joseph on 6/1/2015
Joseph would recommend this product to a friend
I have this setup currently for my system. While the instructions are not as straightforward as I'd like, there are plenty of videos online to learn how to set everything up. There are several ways to use this product which are part of what makes it good but also part of why the instructions are a little confusing. Nevertheless, it works great and worth the money IMO. Get it.
EXCELLENT PRODUCT By MARIO on 6/1/2015
MARIO would recommend this product to a friend
IT IS A PEACE OF MIND, NOT HAVING TO WORRYING IN ADDING WATER AND SALT EVERY TIME IT GETS LOW.
Fantastic By Plomanto on 5/28/2015
Plomanto wouldn't recommend this product to a friend
This thing is awesome . Very easy to install and works exactly as described. I highly recommend this product for any one looking for an ATO
over 5 years and it is the best! By mathdoc on 5/22/2015
mathdoc would recommend this product to a friend
I have had one of these as my overflow system along with a 20 gallon food grade trash can filled with water plus some Kalk for over 5 years. When I first purchased it, I remember reading it might not last with kalkwasser. Well, 5 years and 1000s of gallons later, the unit is still functioning perfectly. When it dies someday, I will not think twice about purchasing any other brand. Don't think twice, this is the best top of on the market!
Mixed feelings By Wolfentank on 5/16/2015
Wolfentank wouldn't recommend this product to a friend
I've been using one of these for about 8 months or so, and I can't say that I love it or hate it. It's possible that my unit may have a defect as it will occasionally over fill and trigger the emergency alarm. At the same time I had a cheap $10 float switch/dosing pump set up on a nano tank that was flawless. Overall, this is a pretty good ATO and I do like the alarms. I wish it had some kind of switch to turn it off/on for when I'm doing water changes though.
Worth every dime! By Gerry on 5/14/2015
Gerry would recommend this product to a friend
The $200 dollar price tag is a little hard to swallow... But the peace of mind is completely worth it. Even though the instructions were a little hard to decipher because their English was badly translated(at least for me it was) the set up was simple and quick.
I did have a defect with the laser eye but BRS was super quick on getting squared away.
Wish everything was this easy. By jon on 4/27/2015
jon would recommend this product to a friend
drop it in tank. connect a few wires. fill container. set optical level. done...
only issue i had i had to call to figure out where the sensor picked up its not the tip its the beginning of the cone. has multiple sensor options and fail safes. highly recommend.
would recommend this product to a friend and reefer By Frank on 4/27/2015
Frank would recommend this product to a friend
This is my 2nd one have two tanks 90 gallon and 180 gallon on my 180 Gallon have been running the 1st one for over two years now and have not one issue the best thing out there, I have used, different ATO but this is the one everyone should go with. ALL REEFERS THIS MUST HAVE save you lot of time. Just set it up keep water in the pump unit that you used and walk away.
Perfect..!! By Dinoflagellates on 4/23/2015
Dinoflagellates would recommend this product to a friend
I should bought this ATO a year ago an forget the daily top of. This set is all I needed for my 150 gal reef aquarium..!
Worth the price By Andrew on 4/19/2015
Andrew would recommend this product to a friend
I got this ATO unit to replace an old JBJ unit I had on my 55 gallon. What a step up in quality. I really like the 2 sensors; the laser sensor to measure and monitor water level for the ATO and the float level for backup to prevent overfilling. Works like a champ! This unit has its own water pump which is a big plus. Made by Tunze in Germany. Build quality and engineering of a BMW.
Would recommend this product to a friend By James on 4/12/2015
James would recommend this product to a friend
I liked this ATO so well I bought a second one for a tank I have set up in another part of the house. Its simple to use and maintain. The instructions are almost too detailed, in my opinion, I had to read them several times but they are effective. I like the two different means of shut off, the electronic sensor and the float valve. BRS TV should consider a video installing one of these and setting up the electronic eye, to support the complicated instructions. Great product IME.
Best ato By Mike on 3/29/2015
Mike would recommend this product to a friend
I pick this unit up two years ago on Black Friday and it's been running like a champ since. as the BRS YouTube video indicates the laser as well as the mechanical part of this provides a great backup is fairly easy to put together which sometimes is in the case with Tunze Products but this is been doing the job for two years.
Works perfectly By Chris on 3/27/2015
Chris would recommend this product to a friend
I love this thing. It works perfectly and has never failed. Not much else to say than that.
eliminated manual topoff By Greg on 3/23/2015
Greg would recommend this product to a friend
I like it So far no issues. The reviews were good. Instead or trying something I am usually using others experiences to save me the anguish of poor decisions
A necessity By JonnyReefer on 3/19/2015
JonnyReefer would recommend this product to a friend
It's so nice not having to get 3 half-gallon cups per day and bend down to refill my sump. And no more micro-bubbles! Although the little nut&bolt that holds the output line to the tank attachment was a PITA to get on, it was a breeze to set up.
ato By luis figueroa on 3/19/2015
luis figueroa would recommend this product to a friend
bought my first ato about two weeks ago and I must say its been the best purchase ive ever made in this hobby. keeps water level and stability in parameters. so far so good.
tunze 3155 By Derek on 3/18/2015
Derek would recommend this product to a friend
I love this thing. no more worries when im not around for a few days. works excellent just as expected from tunze. easy to set up
Easy to use and no need to worry about your tank By Hamad on 2/28/2015
Hamad would recommend this product to a friend
It saved my time and i do not need to manualy add water. i used it for 200 gallon tank. Thanks BRS
Super Product By RDM on 2/20/2015
RDM would recommend this product to a friend
This was easy to setup and get working. I never realized how much I hated having to manually top off my water until I put this in my system. Now I just check my water levels and the fresh water supply and this takes care of adding water as and when it's needed.
EASY and works great By Jeffrey on 2/15/2015
Jeffrey would recommend this product to a friend
So far so good ! Have this set up on roughneck bin I'm using to cure my dry rock in. Works perfect and secondary safety offers great piece of mind. In the room one day when pump came on.. manually lifted float and audible alarm sounded and pump shut off. Very comforting to have a piece of equipment like this that is looking out for me ! If you are on the fence, JUST GET IT, you won't be disappointed.
fantastic ATO By Hawrasser on 2/11/2015
Hawrasser would recommend this product to a friend
this ATO is great. keeps the water level in my sump constant. the only thing i would change is to make the amount of travel on the floating switch a little bit larger. if i turn on my protein skimmer it will sound the alarm but my skimmer is also huge haha
Hoping to get it working By Andrew on 1/16/2015
Andrew would recommend this product to a friend
I have had this on an AIO tank (40 gallon) worked great the first week, now it keeps overfilling my tank( alarm going off) in the process of troubleshooting it with Tunze, hope i can get it to work correctly. I wish it worked right out of the box, but based on reviews the Tunze auto top off is suppose to be the best. I have owned other Tunze products before with no problems. Not bashing the auto top off but its not working out of the box. But Tunze customer service is great at helping.
Great ATO! Never missed the target! By Alec on 1/15/2015
Alec would recommend this product to a friend
I don't need to add anymore to those 200+ reviews but I put mine on a timer that only turned on once a day for 10 mins. That way it's not pumping all day long and will never over fill.
Works Great By John B on 1/10/2015
John B would recommend this product to a friend
Easy set up and I love the optical sensor. My old ATO float valve would often not register the water level depleting and I'd have to refill the sump manually. No issues so far and don't anticipate any. I did have to run the top off line into the tank overflow since my storage container is taller than the sump, but there was plenty of supply hose and I actually like it better.
Best ATO ever By Seadog09 on 1/7/2015
Seadog09 would recommend this product to a friend
The name alone represent quality so you know from start to finish that's what you'll get. I'm happy with my purchase and I know you will be too..
Works flawlessly. By DivingTheWorld on 1/5/2015
DivingTheWorld would recommend this product to a friend
I've had this running for about 4 months now and it works flawlessly. It's really a set it and forget it product. The one quirky thing is that when it first turns on, it will pump water for a few seconds to purge the pump of any air. This is normal and not a but per say, but something to be aware of. I initially had this programmed on my Apex to only turn on a few times a day, but found that it was pumping too much water (due to the starting purge). So now I just leave it on 24 hours a day and it works fine.
Works as promised By Jay B. on 1/4/2015
Jay B. would recommend this product to a friend
I bought this to regulate the level in my sump, using RO/DI feed. I also purchased the optional valve. The setup is easy, especially because of the way that the two level sensors are cleverly mounted with the magnetic holder. I turned the water feed on on and everything worked like it was supposed to. Now I don't have to keep fiddling with my protein skimmer to get the right quantity skimmate.
Almost perfect By Jim on 12/27/2014
Jim would recommend this product to a friend
This is a really great ATO system. There is one downside. If you are pumping the water into your sump, the top level of the top off water container supply cannot be higher than the sump water level. The pump is centrifical, and allows water to flow through the pump when it is off. If the top off water is higher than the sump water, a siphon will occur, and water will continue to flow until the water levels equalize (including over-running the sump, and onto the floor. You simply need to select the right top off container.
ATO's Don't Get Better Than This! By Bernie on 12/20/2014
Bernie would recommend this product to a friend
The Tunze was superior to my first ATO set up which used a float valve and lifter pump. The optical sensor is great and having the second float valve to protect against overfilling is just a smart investment to protect not only your tank but the flooring around it.
I have a controller in which I could probably have set something up myself but for an all in one package this system is great.
Very Cool! By Trent on 12/16/2014
Trent would recommend this product to a friend
This is a great product. Easy to setup and trouble free.
One funny thing is that the way that the LED indicator lights are mounted inside the control box allows for "bleed over" from one light to another. So, in my particular case, the way that I have it mounted inside my cabinet makes the "Too High" appear to be lit when in fact it's the "Level" light. It took me a couple of plug-unplug cycles to figure that out.
But, it's great product. Recommended!
Still the best! By Martin on 12/15/2014
Martin would recommend this product to a friend
There have been a lot of additions to the ATO market over the last year or so. The Tunze 3155 Osmolator is stil the best unit on the market. Reliable and dependable. If you're undecided because of price, don't be...just buy it and be glad you did.
Works flawlessly By GARY on 12/15/2014
GARY would recommend this product to a friend
Bought one thanks to the positive reviews here and I owe the reviewers here a debt for getting it right and saving Me Money making a mistake.
Want an ATO, click 'ADD TO CART' on this and be done with it.
great product By kalen on 12/11/2014
kalen would recommend this product to a friend
I recently bought the tunze ato and I had heard many good things about it. I did many months of research and I finally decided to buy it and replace my smart ato which was always failing. I would recommend this product to others