great By chuck on 3/24/2014
chuck would recommend this product to a friend
Worked great for my nano tank. was out of town 10 days and not one problem
Great Product By reefer63 on 1/29/2014
reefer63 would recommend this product to a friend
Installed in a half hour works great on my biocube 29 keeps water level constant no problem
Works like a charm! By 08TRDOFFROAD on 12/16/2013
08TRDOFFROAD would recommend this product to a friend
Installed this ATO on a Biocube 29. I had a little bit of an issue with the pump not shutting off properly after my initial install. After a short conversation with Tunze customer service we determined the switch was being interfered with by the magnet from my Tunze 9002 skimmer. I moved the switch to the other side of the return chamber away from the skimmer magnet, and it works like a charm!
Good By C on 12/13/2013
C would recommend this product to a friend
I am satisfied with the Tunze product
Best ATO purchase By Oscar on 11/26/2013
Oscar would recommend this product to a friend
I love this ATO easy to put anywhere either in sump or in your tank. I love that it had magnets not suction cups that easily fall of and can dump water into your sump. I also, love that it includes its own pump without the need to purchase one and the replacement its cheap aswell.
Ok product, but be careful By Nano Pete on 11/26/2013
Nano Pete would recommend this product to a friend
After almost flooding my basement twice and contacting Bulk reef supply; I was contacted by Tunze technician and he worked with me to fix my problems. When attaching switch with magnet onto sump glass the maget affects the switch if the glass is too thin. I needed to shim between the two magnets for the switch to work properly. Also, be aware of creating a siphon from reservior to were your supplying ATO water. As far as quality; You get what you pay for...
Pros- works as advertised.
Cons- doesnt come with clear instructions
Excellent ATO By Michael on 11/25/2013
Michael would recommend this product to a friend
I just installed this in a Nuvo 24 and it's working excellent to keep my water level exactly where I want it. The pump can fit right into a 5 gallon polyurethane jug without modification, which is really nice if you don't have a special RO Reservoir. It was easy to assemble and install and the pump is quiet enough to not bother my wife.
My only two complaints of this system: I wish the control box had tabs to mount with screws to the interior of my stand and I would love for the control box to have some kind of LED that either indicates the unit is powered or that the pump is on. I feel like for the price a single LED in the control box isn't a crazy expectation. Other than that it's an excellent product.
Great product By Bobo on 11/23/2013
Bobo would recommend this product to a friend
We'll built . It got to me very speedy with great shipping and packaged well. Works like a charm I will deff be getting another
Great product from Tunze, no surprise there. By Andrew on 11/2/2013
Andrew would recommend this product to a friend
works flawlessly. Only regret is not getting the bigger model with two sensors. the 5 second time out feature is great piece of mind however.
Perfect for my Nano tank By MICKEY on 10/7/2013
MICKEY would recommend this product to a friend
No issues so far. I installed this in an 8-gallon tank so I am especially happy for the auto-cutoff. Seems pretty solid!
upgrade By Red Fish on 10/4/2013
Red Fish wouldn't recommend this product to a friend
I purchased this nano because I was so happy with the 3155. May of this year.
It never really worked like it should, it had an electrical problem right away but I thought I could live with it until just stopped a few days ago. My hubby checked the electrical current and it did not have one.
So I am now purchasing the 3155 to replace this one. If you are trying to decide which one to go with. I HIGHLY recommend the 3155 even though it is more expensive. I wish I had.
Nano ATO jury still out By RikerBear on 9/26/2013
RikerBear would recommend this product to a friend
I bought two of these for my nano reef and for my FOWLR. The one for the nano works great...thenone on the FOWLR sticks and won't always activate (pump not float sensor).
I ordered a replacement pump, so we shall see how it works
Simple and easy set up. By Barbra on 9/7/2013
Barbra would recommend this product to a friend
I purchased this to complete my nano set up. I have a 24 gallon Nuvo by IM and this ATO compliments it well. I installed last night in about 15 minutes. Worked well when I tested it. It fits great in the back chamber.
One of the best additions to my tank! By Paul on 8/8/2013
Paul would recommend this product to a friend
Definitely one of the best additions to my tank so far. It was easy to set up, and I haven't had any issues with it yet. Throw the pump in a container with RO/DI, set the float where you want it, plug it in, and away you go. Water level is staying constant and salinity is stable. It's great! Going to eventually upgrade to the 3155 and use this for my QT/HT.
Does what it needs to do! By Brett on 8/5/2013
Brett would recommend this product to a friend
Installation was simple and easy to understand. Strong little pump. Has no problem pushing the water from the bottom of my stand to the top of the tank (JBJ 28 Gallon Nano Cube w/stand).
Working great. The magnetic mounting system is fantastic. By Arabo on 7/24/2013
Arabo would recommend this product to a friend
I bought this system to pump some distilled water from a 5 gallon water tank to a container that is about 10ft above. The pump was a bit too large to fit into the 5 gallon tank and I had to use a smaller submersible pump but the magnetic mounting system for the float valve alone was worth buying it.
BulkReefSupply offers great customer service and support.
Easy and high quality By Chris on 6/6/2013
Chris would recommend this product to a friend
Although pricey, this system includes everything you need to safely and easily automate top offs, minus a reservoir. The builtin safety features keep your tank from overflowing or constantly running the pump in an empty reservoir.
Very nice little nano ATO By tim on 6/3/2013
tim would recommend this product to a friend
Small...perfect for nanos. Not all the bells a whistles as the full version, but for a nano, you can't beat it. Solid product, very strong magnets.
Great for a 45 gallon tank with 15 gallon sump By Butters17 on 5/24/2013
Butters17 would recommend this product to a friend
Ive been using this product for about 6 months now. Has not failed me yet. This is a must have for saltwater tanks, keeps water levels/salinity the same. my only regret is not getting this sooner..
When i eventually get a larger tank ill get the bigger tunze osmolator for sure.
awesome By ReefDVMs on 5/13/2013
ReefDVMs would recommend this product to a friend
Typical tunze product well built and works like a charm, recommend this to everyone with ATO system
Budget Friendly By Victor D on 4/30/2013
Victor D would recommend this product to a friend
More than enough for my 29g Biocube
Easy to set up (Except the tube for the pump)
Only runs for 1.8 seconds but can be boosted up for bigger tanks. (No fear of flooding)
Float has to be Installed PERFECTLY Vertical. Mine got stuck on the first day. Luckily I was in front of the tank. I knocked the sensor and it stopped pumping.
No alarms. The motor will just pulse every 10 secs. You wont hear it unless the room is silent.
Does what its suppose to. If you're on a budget its a good buy. In hindsight wish I would have held out to buy the reg Osmolator with the alarms and laser eye!
Great Product By Justin on 3/24/2013
Justin would recommend this product to a friend
This is a great solution, especially for a nano reef. The magnet mounts are strong, and I am confident they will hold in place. The unit itself is tiny, and pretty inconspicuous, even if going into a display tank rather than a sump. The only drawback I see is it is a bit noisy when compared to my other tank, which I use an aqualifter on for the ATO.. but it is not obnoxiously loud.
1 bit of info that might be useful to include in the product description is the diameter of the pump. This could be important depending on the top off container that is used. For my purposes, I used a small potable water container designed for a boat or RV. The biggest opening was 1.75 inches, which I thought would be ok for the pump. Turns out the pump diameter is 1/8" larger, so I had to cut a new hole in the tank using a hole saw. No big deal, but would have been nice to know the size before ordering.
Perfect for smaller tanks By Ronald on 3/24/2013
Ronald would recommend this product to a friend
Bought this top off for our 29g tank. Set up took about 5 minutes. Very easy. I really like the back up timer of not letting the pump run for more than 2 minutes. Really assures that im not going to over fill my tank.
does and donts By daniel on 3/10/2013
daniel would recommend this product to a friend
ok i got this ato for to do 2 things add kalk and add top off water at same time. i put it on my redsea max 250 that i upgraded with a refugium because the filter and skimmer just dont cut it on this tank so i built a custom sump for it. after i put the tunze top off in the sump i set it up where when it tops off water right where it poors over the last chamber witch caused current to let me know it was keeping it at same lvl. if theres a little water current it will kok the float bobber some what and wont let it drop freely so make sure if you get this to make sure it tops off enough to make less water current are add something to keep current away from float bobber. other then that i found no issues so far with this product plus it has a run time that if it runs to long it wont run no more and wont until you unplug it and back in to reset it. plus the little pump that comes with it works awsome cant complain.