Gravity ATO

Discussion in 'D.I.Y.' started by Ryane7, Dec 30, 2017.

  1. Ryane7 Emerald Crab

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    Just wanted to put this up in case anyone else is interested. I made a box with scrap acrylic put in 2 1/2" bulkheads and attached valves
    top one for filling
    Lower one will fill return reservior when water level drops and breaks the vacumm allowing water to enter the sump, and sealing pipe once water level rises

    I'll keep this updated to let everyone know the problems I run into. 20171230_163456.jpg
     
    Last edited: Dec 30, 2017
  2. Humblefish

    Humblefish Dr. Fish Administrator LARC Supporter

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    Excellent idea! ':0:0'
     
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  3. GPReefer

    GPReefer Let the Fin Begin! Administrator LARC Supporter POTM Winner

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    Nice. How much water does it hold? Seems like you are getting a lot more stuff under there than I had - and I didn't think that was possible. :D
     
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  4. Ryane7 Emerald Crab

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    6.5 gallons and I could have made it a bit larger but it would have made it difficult to fill. And yes it's really getting crowded I'll put a few pics in the build thread.
     
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  5. clsanchez77

    clsanchez77 Reefkeeping Extremist Global Moderator

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    Keep me posted on this please. Admittedly, I am suspect that you will successfully seal a vacuum in 1/2" pipe. But then I am a skeptic...and an old ***, so don't let that stop you :D I am assuming the top valve would normally be closed to provide that seal.

    PS, I like the return loop you did to get that valve in :D. I shake my head at some of the jerry rigging we have to do to accomplish what seems like should have been a simple fittings. I had to do something similar to plumb in my UV in order to fit in a shut off valve for service. It involved a few 45 and 90 degree bends.
     
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  6. Ryane7 Emerald Crab

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    It s working it is currently holding about 3 gallons of water with top valve closed and bottom valve open.

    Lol yeah the plumbing loop was the only way I could figure to run return and still allow room to put a tee to add reactors in the future
     
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  7. BluewaterLa

    BluewaterLa LARC Boil Master Administrator LARC Supporter

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    Innovation in the hobby, good job.
    I am a little slow sometimes and trying to look at what you built and read what you describe I am still trying to figure out how it is supposed to work.
    Mind helping me out here understand the principal behind your design ?
    I cant afford to loose any more hair thinking hard LOL
     
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  8. Ryane7 Emerald Crab

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    I built a sealed box with scrap acrylic
    And 2 bulkheads a top and bottom
    Installed valves on both
    The lower port is piped 1/2" below the water level in my return reservoir
    Close the bottom valve and fill the tank thru the top valve
    Then close the top valve and open the lower valve
    When you loose water from evaporation the water level will drop below pvc pipe allowing air in and water out. Replacing your lost water. once the water level rises the air can no longer enter and the vacuum seal is regained stopping the water flow.
     
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  9. Ryane7 Emerald Crab

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    Ato has been in place for a few days and it's working perfectly. Only negative I've noticed is it's loud when it releases water it almost sounds like a toilet flushing.
     
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  10. clsanchez77

    clsanchez77 Reefkeeping Extremist Global Moderator

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    Yea, with 1/2" pipe, that should be quite a gurgle with each release. Perhaps you could find some kind of insert bushing to reduce the diameter at the discharge point. That would reduce the bubble size and slow the water down some. Or maybe cut the pipe back and replace with a short length of tubing. Try 3/8" tubing first then go smaller or bigger depending on the result. Tubing is cheap and the 1/2" MPT adapters are not too bad.
     
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  11. roid reefs Aptasia

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    Ive always wondered about these. although it does not allow water to flow all the time, there is still an open waterway between the ato reservoir and the sump, correct? if so, have you noticed any fluctuation in the salinity of the water? although no water comes out, there will still be some water exchange between the sump and this top off pipe when the water level is correct in the return chamber, basically small amount of water flowing into and out of the pipe at the same time.

    im assuming the exchange is so small that the salinity does not fluctuate.
     
  12. Ryane7 Emerald Crab

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    No there hasn't been any salinity fluctuation the surface area where the rodi water comes into contact with the tank water is .79 sq/in
    Any osmosis that does occur is being flushed out since it is flowing approx 1 1/2 gallons of replacement water every 24 hrs
     
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  13. clsanchez77

    clsanchez77 Reefkeeping Extremist Global Moderator

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  14. Ryane7 Emerald Crab

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    '????'
     
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  15. BluewaterLa

    BluewaterLa LARC Boil Master Administrator LARC Supporter

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    HaHa me too man LOL

    Stinky eduMacated folks around here wearing their fancy pants providing links and stuff haha
     
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  16. BluewaterLa

    BluewaterLa LARC Boil Master Administrator LARC Supporter

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    I do think that this is great you are having success with this set up.
    I am interested to see in the future if any issues are discovered, Knock on wood //// I really hope it stays solid for you
    Good luck and happy Reefing
    BluewaterLa/ Mike
     
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  17. clsanchez77

    clsanchez77 Reefkeeping Extremist Global Moderator

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    Not me, I can't figure out that level of math.
     
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  18. Ryane7 Emerald Crab

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    Biggest problem I have at the moment is filling it takes a while I'm siphoning water into it with 1/4 tubing I'm gonna make a bucket with a uniseal and fittings to 3/8 tubing
     
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