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
Performance
294 Review(s)
$199.99
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  • one of the great products out there. By on 9/23/2016

    I have been using this auto fill for over a year and it has been great, i have found that the five gallon bucket that I keep under my 60 gal. max c tank has to be cleaned a couple of times a year and that:s it, i;m getting ready to get another one for my wife:s 25 gal.coral tank.
  • Other options less expensive and similar reliabillity....... By on 9/12/2016

    I bought the Tunze Osmolator even though it was the most expensive ATO because I wanted to get the most reliable unit I could. Unfortunately over the last 4 months I've had continual problems with the unit. After the initial installation it would start and fill up to the optical sensor, but then a few minutes later kick back on and continue filling up to the back-up float switch. I run Kalkwasser in my ATO so that was pretty concerning.

    After removing, cleaning and reinstalling the unit seemed to function ok for a couple weeks but not it kick's on the first time it's plugged in but stops after 15-20 seconds and never starts again. I've tried cleaning, repositioning the sensor etc. but no improvement.

    Just buy the JBJ and keep the float switches clean on a regular basis.
  • Great idea just willl not function as promised By on 9/4/2016

    I have had this for about 18 months, I loved a raved about it at first, Problem I have had is the pump will stop shot. Tunze has sent me about 4 new pumps. They all do the same. pump will only run about 15 seconds. the controller says pump is on but its not on. I paid 200 for this system so I really wanted it to work, I am going to cut my losses now because as you all know this ATO is critical part of keeping my reef tank stable
  • Quit after less than 2 weeks By on 7/8/2016

    After a loss of power,short term and yes it was on a surge power bar,Checked all aquarium,allOK.Wife comes in 1/2 hour latter says an alarm is buzzing.Checked it out sump high level ;luckily float stopped pump.So much for Tunze as Best ATO.
  • Easy top off By on 6/20/2016

    I bought a 5 gallon tank next to my sump. Threw this in the tank with my RO/DI water and worked instantly. Very convenient, easy to use, accurate.
  • Awesome product By on 6/13/2016

    The Tunze Osmolator was a great purchase. I used to have to fill my sump manually every day. This allowed me to to focus more of my time on other areas of the system. I have it plugged into my Apex controller and programmed to shut of during feed mode to keep the alarm from going off. Also have the Apex to shut it down if the salinity in my take drops. Even without the Apex this would be a "must need" purchase.
  • replacement By on 6/7/2016

    I been using this ato since i started the hobby back in 2014. Well the ato finally died on me, i was looking around for a new ato - wasn't really impressed with anything else out there. Figured i already had the experience with the tunze ato, why switch when i already know how this product already performs. Highly recommend.
  • Great ato. Works as advertised. Pump fits in 5 gal jug By on 5/17/2016

    This top off works really well. The only thing to remember is to prime the pump but after that it runs like a champ.
  • So long to my KW drip By on 5/6/2016

    After months of setting up an evening kalkwasser drip (and often forgetting to set it up), this is a real time saver. Once a week now I fill my top-off bucket and it keeps my sump consistent and slowly doses my KW. I'm a fan.
  • You will HAVE to replace in 2 years By on 4/26/2016

    My recommend to buy is very tepid. You will only get about 2 years max out of one of these units. I really want to like it, but, the eye stops functioning after 2 years. All the cleaning of the eye will NOT make a difference. I have 1 hour to get to bed and get up in the morning for an early flight and I'm in travel he!! week, 6 flights. I can NO longer rely on this essential piece of equipment to maintain my tank. I will probably loose several SPS as a result of my jacked up tank all because this ATO failed --- AGAIN. This is the 3rd one I've bought that does this, it is NOT an isolated one off case at all. Poor quality in the long run. I will never buy again.