Osmolator Universal 3155 Auto Top Off - Tunze

Tunze Osmolator Universal 3155 Auto Top Off
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  • Tunze Osmolator Universal 3155 Auto Top Off
  • Tunze Osmolator 3155

Osmolator Universal 3155 Auto Top Off - Tunze

SKU: 202307
316 Review(s)
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  • Works Great By on 4/20/2017

    Easy to use and setup, works great!

    I got this one in from BRS and nice easy install and works like a charm. just be careful of the magnets you get those stuck they are a pain to pull apart. tip leave them on the foam until you need to put on tank.
  • Great product By on 4/4/2017

    Works great keeps water lol steady
  • It works By on 4/3/2017

    It's impossible to say whether this is a quality product after only owning it for a month, it's brand new so I would fully expect it ro work and do everything as advertised. I'll just have to wait and see how it functions 2 or 3 years from now. I can say that it was easy to setup and has functioned properly so far. I purchased this ATO really just for times when I'm away from home and can't manually top off my tank. I prefer to manaually fill the tank each morning after I test the salinity. I'm going to have to either fill the ATO reservior or the tank, may as well just fill the tank. I bought this unit because it was the most expensive and had the best reviews. Time will tell if it was worth the investment.
  • Reliable! By on 3/27/2017

    I bought this ATO about a year ago...no problems and has worked flawlessly ever since. After I got it, I wondered why the heck I waited so long to get it.
  • Great Addition By on 3/15/2017

    This is a must have product. I have a 3155 and 3152. They took a little effort to dial in but once set they have worked flawless. I no longer worry about checking daily water levels. I fill the reservoir once a week and let the system do the rest.
  • It Works Now By on 3/14/2017

    Read and heard many good things about this ATO prior to purchasing. Hooked it all up and got my sump level where I wanted and it woke me up the first night screaming about too much water. I check it and the ATO DUMPED TOO MUCH WATER! WTH! I unplugged it and left it for the day. Not sure if the sensor needed to sit in my water or what but since then it has worked perfectly. I turned the alarm off because it screams when the water gets too high...every time you go into feed mode because the sump level rises when the return pump is turned off...annoying.
    One thing I REALLY DISLIKE is the pump is supposed to turn off if the container runs out of water. This is NOT THE CASE. I got up real early one morning to hear a whinning from my tank. Turns out the ATO pump was running dry and not shutting off. I checked the dial and it is in the middle so it should have shut off after a short time....
    Just a piece of advice, do not make the hose from the pump to your sump too long into the sump. My container and sump are the same height and it will create a suction and pull the water out of the container until it levels out. Did this the first time and it pulled 3 gallons out. :)
    If I had it to do over again I would not buy this since I have an apex now.
  • My Go To Auto Top Off By on 3/13/2017

    I've had several different auto top offs from various manufacturers on my tank and this one is by far the most consistent and reliable. Not only is the set up easy, it just works. This is a plug, play and forget as it doesn't require any extra thought. It provides warnings, has back up redundancy built in and never overfills. Buy this and don't look back.
  • Tunze 3155 By on 2/28/2017

    I have this product on my 265 gallon freshwater tank and works PERFECT !!!!
  • Definitely Worth the Money By on 2/27/2017

    I have been running this ATO for over a year now and still would recommend this product. The optical eye sensor is the main feature that sold me on forking out the money for this ATO and it has not disappointed. I'm using a plastic 5gal container to hold water and using the ATO to pump that to my tank. The setup was simple and I have had no problems with the functionality of the ATO system. My only complaint is that the pump is pretty noisy for our situation. Our tank is in our bedroom and the ATO container is outside of my tank so when it kicks on in the middle of the night it can get a little noisy but not enough to wake me up. This significantly reduced my daily maintenance on my tank and keeps my water params more stable.