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.
Perfect By Anneke on 4/30/2014
Anneke would recommend this product to a friend
I have had this ATO for a couple weeks now and it is so reliable that I almost forgot I have it. It was easy to set, and did not need a break-in period.
German product. By waterflyer on 4/26/2014
waterflyer would recommend this product to a friend
Need I say more. This is made in Germany. Extremely high quality product. I actually have mine 20 feet away from my tank and it pumps it with no problem. Horizontally and with only a 4 ft vertical height above the actual pump. Great system, very reliable!
Must Have By Jason on 4/23/2014
Jason would recommend this product to a friend
I can't believe I ever went without this! It flat works, no questions asked. Easy setup, no brained operation. Well worth it.
Set it and forget it By Arrick on 4/23/2014
Arrick would recommend this product to a friend
This product works exactly as described is easy to set up and will easily be the most trusted piece of equipment you will have in your system.
Don't skip out on this! By Michael on 4/22/2014
Michael would recommend this product to a friend
After having a 180g reef leak from a poor install and destroy 1100sf of my house I have learned that there are certain items that you do not skimp on to save money and a good return pump and ATO are one of them.
Not only will you have the piece of mind that your ATO will not flood and ruin your floors but your reef will be happier and your skimmer will work like never before!
This ATO is amazing and is well worth the price.
So far, so good By Anneke on 4/17/2014
Anneke would recommend this product to a friend
This was easy to set up and started working immediately. There was no break-in period.
Very good product By KEITH on 4/15/2014
KEITH would recommend this product to a friend
Tunze 3155 works as described shut off valves are the best
Optic sensor failed By Me on 4/15/2014
Me would recommend this product to a friend
I just came home, and the water level was 2 inches low.
Optic sensor out of the water but nothing happens.
Worked fine for one year thats all.
a must By Nick on 4/13/2014
Nick would recommend this product to a friend
It works, its everything it is supposed to be! I love the dual level sensors and the pump is near silent. I think everyone understands they need an ATO. This is the best way to go.
Keep Tank Stable By Mitchel on 4/11/2014
Mitchel would recommend this product to a friend
Another great product from a great manufacturer that has been around forever. This ATO helps keep your salinity in check which helps for a better overall stable system. What else can you ask for out of a product.
Simply works perfectly By Eldog on 4/7/2014
Eldog would recommend this product to a friend
Operating top off for 230 gallon reef tank with 75 gallon sump for three years now. It's truly a set it and forget it system, maintains perfect top off levels for optimum in-sump skimmer operation.
Fool Proof By Ryan on 4/5/2014
Ryan would recommend this product to a friend
I'm a rookie when it comes to saltwater reefing, this unit is by far the best purchase I have made. Easy to use and definetly plug & play
The Best By Matt G on 4/1/2014
Matt G would recommend this product to a friend
Easy to set up works the way it is supposed to work. I am very happy with it so far.
This thing is awesome. By Bill on 3/27/2014
Bill would recommend this product to a friend
We bought this thing for a new tank set up we are doing, but then decided to do a gravity fed replenishment tank instead, so we weren't going to use this... until the next night when the auto top off on our current system died. I pulled this one out of the box and set it up in about 20 minutes or less.. This thing is amazing.. Works perfectly right out of the box and is super easy to set up. While we are going with gravity fed on our new tank, I would recommend this to anyone that can't do gravity fed.
Tunze Osmolator Universal 3155 Auto Top Off By james on 3/26/2014
james would recommend this product to a friend
easy to set up works the way it is supposed to work. I am very happy with it so far. just make sure the place you put the water into the tank is higher then the container you store the water lol
Great ato system By Judith on 3/26/2014
Judith would recommend this product to a friend
I chose this system because it contains everything needed to set up. The first day the pump would turn on and fill up until the alarm sounded. After unplugging and letting sit in the sump submerged in water overnight, I replugged it in and haven't had an issue since.