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  • Tunze Osmolator 3155

Tunze Osmolator Universal 3155
Auto Top Off

SKU: 202307


  • Must Have By Jason on 4/23/14

    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 4/23/14

    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 4/22/14

    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 4/17/14

    This was easy to set up and started working immediately. There was no break-in period.
  • Very good product By KEITH on 4/15/14

    Tunze 3155 works as described shut off valves are the best
  • Optic sensor failed By Me on 4/15/14

    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 4/14/14

    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 4/12/14

    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 4/7/14

    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 4/6/14

    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

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