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
Tunze osmolator 3155 Top Off By Joe on 12/10/2014
Joe would recommend this product to a friend
This is the best automatic top off system I have 3 of them on different tanks. Easy to set up plug and play. They been running for over 3 years with no problems.
The best By John g on 12/9/2014
John g would recommend this product to a friend
Very easy to set up and extremely accurate
Easy Setup By Evelio on 12/9/2014
Evelio would recommend this product to a friend
It was easy to set up straight out of the box. This is one of the best investments that I have made for my tank.
ONE WORD....WOW!!! By NASSAUREEF on 12/8/2014
NASSAUREEF would recommend this product to a friend
This top off is amazing very easy to setup. Don't waste your money on another brand cause it will cost you double and you will end up with the tunze , so buy it the 1st time and it will be the last one you will buy..
Simply perfect By Nate on 12/8/2014
Nate would recommend this product to a friend
I have used two tunzes osmolators on different tanks and I have never had an issue. double back up (float sensor and auto times pump shut off) makes me not worrying about having water over flow. and all the install hardware added is always a bonus, like the return tube holder.
best investment i made By Andre on 12/6/2014
Andre would recommend this product to a friend
My first ato and only I will buy. very happy with this ato. Easy to install
Love it! By Joshua on 12/5/2014
Joshua would recommend this product to a friend
I have had a few different ATOs but this one is by far the best I have had. Don't know why I didn't just get this one from the start.
GREATTTTTTTTTTTTTT By TOM on 11/29/2014
TOM would recommend this product to a friend
Just got this auto off was really easy to install took about 30 mins and WOW... this system is great would recommend this to everyone. I was waiting for the sale Blackfriday what a great deal...
Can't wait to get my hands on this! By Nelson on 11/28/2014
Nelson would recommend this product to a friend
just order this on black friday special!! can't wait to have it in my tank up and running!
good By Rodney on 11/25/2014
Rodney would recommend this product to a friend
works like it sould saves time having to top off tank evereday
Great Product By Harris on 11/23/2014
Harris would recommend this product to a friend
I've had this for about a month now. It was really easy to set up and has saved me time by not having to top off my sump by hand. All around a great addition to the tank!
awesome By dolpator on 11/23/2014
dolpator would recommend this product to a friend
This top off system is awesome. I have never had one issue with it and it never misses a beat. I used the JBJ auto top off on the past but like the fail safe options. It has been very dependable. And would recommend it to any one. Great product
Works and easy to setup. By Mario on 11/19/2014
Mario would recommend this product to a friend
Instructions were easy to follow. One call to Tunze was answered promptly when I had a question about whether all magnets were waterproof.
Never Fails By FirstContact on 11/10/2014
FirstContact would recommend this product to a friend
This is a great piece of gear. It has never failed on me. Once a year or six months or so, I'll clean the optical sensor from salt. It's in a 100g Rubbermaid stock tank. The pump is in a 32g Brute, and the top off goes through my kalk reactor first.
Perfect Tool By Steven on 11/6/2014
Steven would recommend this product to a friend
Really satisfied with my purchased. Works exactly how it should so I don't have to worry about it.
So Far So Good! By Randy on 10/23/2014
Randy would recommend this product to a friend
This seems to be working like a Charm. However I did have one issue with it right away, for some reason the pump wasn't working when I first plugged it in. I unplugged it for several hours and came back to it to see what the problem was and when I plugged it back in everything worked perfectly. It has kept my tank at a perfect level so far. I have it hooked up with a 5gal tank reservoir and it has given me less time worrying about water level and more time loving my tank!
Amazing Product and never fail By Michael on 10/9/2014
Michael would recommend this product to a friend
I love this ATO!!! I don't ever have to add more water to my sump day in and day out. I have a 10 gal sitting inside tank stand and it lasts about 1 1/2 weeks before having to fill it again. There has been a few power surges since installing it. It has never failed to come back on or sound alarm. Thank You Tunze and Thank You BRS for carrying this item.
Stability By Valerie on 10/5/2014
Valerie would recommend this product to a friend
This unit has not failed once. I use Kalkwasser in my auto top water and the pump hasn't failed yet. The pump is a little bit loud but the BRS staff told me to pull the airline tubing out a little bit and it made it much quieter.
functional and efficient By Steven on 9/8/2014
Steven would recommend this product to a friend
I have used the Tunze for two years now and it meets my expectations. One needs to take seriously the caution to not have the feeder hose under the surface of the aquarium water level. I flooded my office twice doing just that. Also, the pump has a 6 month to a year longevity and they go out without much fan fare. Keep a couple extra pumps, at 23 dollars, on hand. My final caution is not a fault of the unit but I have an auto feeder in my lower tank and when the feeder was too close to the optical sensor flakes of food caused the unit to think the tank was at level and it failed to fill. Keep the food as far away from the sensor as possible. Beyond these concerns, it is a great unit and very dependable.
Gold Standard of ATO By Keith on 9/4/2014
Keith would recommend this product to a friend
The system comes with everything you need to get an ultra-reliable and well built auto top off system in place on your aquarium. This is a must if you want to keep your parameters consistent and your tank running as it should. Make sure and put the rubber feet on both halves of the magnets to keep them from sliding around. I love the redundancy of an optical eye, a mechanical float switch and then a timer on the pump.
makes reefing easy By matthew on 8/23/2014
matthew would recommend this product to a friend
This auto top off makes my life easy, I have had it for over a year now and have never had a problem.
Wonderful product that has made my life easier By David on 8/15/2014
David would recommend this product to a friend
I was a little skeptical at first installing an auto top off. I had fears or dumping 30 gallons of fresh water into my tank with a faulty device or switch. Having this up and running now for awhile has been great! The sensor is very sensitive and adds small amounts of water throughout the day. I also like the back up float switch. It was easy to set up and the magnets make adjustment simple. I now fill my top off container every several weeks and that's all! One piece of caution is to watch the placement of the top of container as you can get a siphon started. Great product!
Phenomenal! By MCHERRI on 8/5/2014
MCHERRI would recommend this product to a friend
I purchased this device a year ago and I cannot begin to explain how wonderful it has been since. No more daily top off. Now you can just sit back and enjoy your aquarium. Coupled with an automatic feeder, you'll spend less time worrying about your fish and coral, and more time enjoying your tank!
Great Pruduct By Crysos on 8/4/2014
Crysos would recommend this product to a friend
I got this about 3 months ago and it is great! Easy setup and it keeps my water where it needs to be. I am home and watching my tank all the time but this is just a great tool to help with top off!
good product recommended. By perry on 7/22/2014
perry would recommend this product to a friend
This is a great product by tunze all-around. the only problem I had with the unit is that the metering bump broke shortly after I received the unit. but I contacted tunze and the quickly replaced the pump at no charge.
Working great. Shutoff redundency By John on 7/7/2014
John would recommend this product to a friend
I have been using this in my 75 gallon or approximately 18 months. It has been working flawlessly. I originally had the sensor in my display tank and when I introduced a sump, I moved the sensor into my sump. I am using RO/DI water with no Kalkwasser added. I like that there are two mechanisms to shut off the unit if the level is higher than it should be.
The best By Jim on 6/27/2014
Jim would recommend this product to a friend
Really not much to say as the product is excellent quality and works. Do yourself a favor and don't cut corners on an ATO.
Simple design with a back up switch By mfief on 6/26/2014
mfief would recommend this product to a friend
if you read the directions this is fairly easy to set up. I didn't want to spend the money but in the end it has been worth every penny. I definitely noticed a difference in my corals. instead of adding a half gallon of top off water in the morning and at night this does the job several times through out the day without forgetting.
I love the sensitivity of the optical sensor and the face that there is a back up float valve and alarm as an insurance policy.
The pump is a little noisy and be careful with the magnets, they are strong and will get more than your attention if you pinch yourself with them.
Easy set up By Joshua on 5/28/2014
Joshua would recommend this product to a friend
Its working great so far. It only took me about 15 minutes to set it up.
Awesome! Best I have used! By Cornfedone on 5/5/2014
Cornfedone would recommend this product to a friend
I have had ATOs but this one rocks! Easy setup, I am able to keep topoffs to a minimum so not to disturb ph, all, calcium levels.
All I can really say, is Love This ATO!
LOVE IT! By Shawna on 5/1/2014
Shawna would recommend this product to a friend
I am SOOOOOO happy that I no longer have to tote around gallons of salt water to top off daily That got old really fast and my tank isn't even that big. This little gadget was easy to mount and works perfectly. Several times throughout the day I'll hear it rev up and top off the tank, keeping my salinity from fluctuating.
Awesome By Chris on 5/1/2014
Chris would recommend this product to a friend
I truly wish i would have made this purchase years ago. It was very easy to install and works like a champ.