Osmolator Universal 3155 Auto Top Off - Tunze

Tunze Osmolator Universal 3155 Auto Top Off
Click on image to zoom
View full size image

More Views

  • Tunze Osmolator Universal 3155 Auto Top Off
  • Super easy install of the Tunze Osmolator 3155 ATO & why we love it.
  • Digging deep into the Tunze Osmolator 3155 Auto Top Off - BRStv

Osmolator Universal 3155 Auto Top Off - Tunze

SKU: 202307
336 Review(s)

reg. $199.99

Special Price: $139.99

Please wait...
  • The best long term ATO By on 10/25/2017

    I have owned a couple of Tunze and a Neptune. Neptune is little more finicky with the water level and the very hardly audible alarm. The Tunze Has been a better product long term. The Tunze does not have that huge plate and float ball of the Neptune. Tunze very heavy duty with very strong magnets. Always make sure your output is above the level of the reservoir or place the hose in a camouflage PVC.
  • Great buy! By on 10/24/2017

    Was a little hesitant to purchase this item, its on the higher end $ wise for a top off. But this unit brings everything you need! and has three fail safe features which for me was the key since my top off tank is 60Gal. I read multiple reviews both here and on forums and this was the highest recommended ATO.
    The only feature I wish that this unit doesn't have is suction cups to hold the pump in place. I solved the issue by zip tying it to a pice of egg crate which kept it in the correct position. Not a big deal as many people use this with Kalk and it wouldn't be ideal to keep it on the bottom.
  • great By on 10/5/2017

    going to by one more for new tanc
  • It just works By on 10/2/2017

    Best ATO out there. Hands down. It just works. Never have to worry about a thing.
    Have one for each if my systems and wouldn't do one without the Tunze 3155
  • Just awesome ! By on 9/26/2017

    What can I say about Osmolator Universal 3155 Auto Top Off - Tunze. Easy to install took me a matter of minutes, being my first one I researched long and hard and this one seemed the best. So far it has been great. I even overfilled my tank myself by mistake and the alarm went off . So far so good a good buy for sure.
  • One of my best purchases yet! By on 9/20/2017

    Wondering why I didn't install one sooner! This thing is a huge time saver. If you're on the fence, just get it. You will not regret the purchase. Mine has worked flawlessly for months. The only trick to know is to flip the pump upside down & release trapped air bubbles if you ever allow it to run dry & it won't pump after refilling the container.
  • Sweet System By on 9/10/2017

    So I watched the video of Ryan hooking up the Tunze ATO. And it literally took me 10 minutes, taking my time, to set it up. The alarm noise is a hoot. Doubt anyone could sleep through that. Really liking it so far. Teamed it up with a Crystal ATO reservoir from Trigger. Really sweet. The wife approves. Win-win!
  • SOLID PRODUCT! By on 9/7/2017

    I thought, "Meh, I won't mind refilling my freshwater by hand daily"........ well that lasted for two weeks. Absolutely love this thing! Took some tinkering to get it right, but after a day or two I have it dialed in perfectly! Keeps salinity on point and now I can easily dose Kalkwasser. One day I noticed the monitor said "too low," but my ATO bucket was full so I turned it off and back on and everything is peachy again :) You won't regret this product!
  • Quality By on 8/27/2017

    Have had for a couple months and has worked perfectly. Tested the safety shutoff and works great. Don't have to worry about sump overflow anymore.
  • Great By on 8/27/2017

    This german made product has lot of magnets and clips and accessories to fit your need. Extremely simple to install. You need to prime the pump when it first starts. Move it around so it can suction the water. I had some cheaper alternatives in the past but this thing works exactly. Didn't have any siphoning after shutoff either.