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- Tunze Osmolator Universal 3155 Auto Top Off
Regular Price: $199.99
Special Price: $149.99
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Starting at: $27.99
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So Far So Good! By Randy on 10/23/2014Randy would recommend this product to a friendThis 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 10/9/2014Michael would recommend this product to a friendI 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 10/5/2014Valerie would recommend this product to a friendThis 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 9/8/2014Steven would recommend this product to a friendI 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 9/4/2014Keith would recommend this product to a friendThe 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 8/23/2014matthew would recommend this product to a friendThis 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 8/15/2014David would recommend this product to a friendI 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 8/5/2014MCHERRI would recommend this product to a friendI 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 8/4/2014Crysos would recommend this product to a friendI 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 7/22/2014perry would recommend this product to a friendThis 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 7/7/2014John would recommend this product to a friendI 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 6/27/2014Jim would recommend this product to a friendReally not much to say as the product is excellent quality and works. Do yourself a favor and don't cut corners on an ATO.
Previously Asked Questions
by Mark on June 5, 2014, @8:39 AM
Does the pump get placed directly in the top off water reservoir? If so what are the dimensions of that pump? I am trying to decide what kind of reservoir I can use before purchasing a ATO.
Bulk Reef Supply Hey Mark,
That is correct. Its a submersible pump that gets stuck right into the top off water. If your interested in this ATO system you should give this blog article a quick read. It goes into a lot more detail on the system (which is one of my favorites).
by David on May 10, 2014, @11:50 PM
Would you happen to know the max head pressure of the Tunze Osmolator's pump?
Bulk Reef Supply Hi David,
The max head pressure on the osmolator pump is 7ft.
by Daire Fontaine on January 17, 2014, @12:23 AM
My Tunze Osmolator ATO keeps getting stuck in the ON position. I soaked the electronic eye in vinegar and it was fine for a week, but then it stuck on again. Do these electronic eyes fail after many years of use? I've been using it for about 4 years. Is there any way to replace the eye without having to buy a whole new system?
Bulk Reef Supply Hi Daire,
We run into very few issues with these but after that length of time I would imagine its possible for any component to fail. We don't have individual parts like the optical eye, but if you give Roger and company a shout over at Tunze USA, he might. At the very least he could likely help you narrow down exactly what it is. The number I have for them is 512-833-7546 firstname.lastname@example.org
by Christian on July 17, 2014, @9:40 PM
If i have a wave maker and this ATO in the same tank (I don't have a sump), would the waves cause the pump to turn on and off constantly? Thanks
Bulk Reef Supply Hi Christian,
In theory it could present a problem but the circuitry in the Osmolator should help to prevent that. Every time the ATO is triggered it runs for a minimum of 15 seconds. It adds overfill to prevent short cycling. In most cases this should be sufficient unless the height of your waves is constantly changing.
by BILL on November 13, 2013, @7:37 AM
what pump do you suggest to go with the3155 osmolator?
Bulk Reef Supply Hey Bill,
The Osmolator actually comes with the pump right in the package so you don't need to buy one!
by Jeff on November 28, 2013, @2:50 PM
How much head will the pump push
Bulk Reef Supply Hey Jeff,
The pump on the osmolator has a max head height of 7ft.
by Ronald on January 13, 2014, @2:32 AM
Just wondering if I need 2 ATO. I know you can place it either in the sump or in the tank, but my question is if I place it in the sump will it also refill my tank in that process. I don't see that happening but if it does please let me know.
Bulk Reef Supply Hi Ronald,
If you have a sump, it MUST go in the sump, in the chamber where your return pump is. This is the only area of your tank that will have a changing water level depending on evaporation (unless its far too late!). Only one ATO would be necessary but it must go in that location if you have a sump.
by Spencer on April 29, 2014, @12:54 PM
I have a litermeter 3 that has failed. It pushes water about 30 feet from the litermeter to a sump tank. Will this pump do the same?
Bulk Reef Supply Hi Spencer,
The max head pressure on the included pump is about 7ft. It likely wouldn't be well suited to this application. That said though, you can get the additional switch socket adapter which would allow you to control any pump via the osmolator system. That way you can use a pump that can handle the head pressure.
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