Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Spa Waterfall type water loss

  1. Back To Top    #1

    Spa Waterfall type water loss

    Early days on this, I've still a few tests to run. Noticing a drop in the spa water with equipment OFF, of about 1 inch every 3 hours. Not seeing any drop in pool level. Looking at some threads on the site, I'm seeing references to 'check valves'. On my set up on the pressure (post filter) side of the set up there is a Jandy that is usually set to allow water back into the pool and spa, it's set at about 2 o clock, so some water goes down the pool return and some goes down the spa return. Is the 'check valve' the spring loaded plastic assembly with a large grommet on it that is pushed against the spa pipe and has a screw thread holding it in position? Or is the 'check valve' the Jandy itself? Will closely measure pool level to see if spa water is being siphoned back into pool. Have not tried running with Jandy's set to spa recirculation only nor set to Pool recirculation only. I've only just confirmed there is something going on.
    This is something like the beastie....it's under spring pressure and has a screw on cap at the end of the pipe.

    http://www.amazon.com/Pentair-Assemb...pa+check+valve


    Thanks

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Spa Waterfall type water loss

    The spring loaded plastic assembly thing sounds like a check valve, though a picture would allow us to be sure. The Jandy valve is not a check valve.

    In a situation like this one, more often than not it is the check valve, but there are two other possibilities: the suction side handy valve might not be closing completely or there could be an actual leak in the spa.

    Does your check valve open for servicing? If so you should open it up and clean out any debris. If it doesn't open, try running the spa for a little while and see if that clears any debris out of the valve. The suction side Jandy valve is fairly easy to check, watch to make sure it stops in the correct positions when switching modes. Actual leaks are more difficult to pin down.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: Spa Waterfall type water loss

    Quote Originally Posted by JasonLion View Post
    The spring loaded plastic assembly thing sounds like a check valve, though a picture would allow us to be sure. The Jandy valve is not a check valve.

    In a situation like this one, more often than not it is the check valve, but there are two other possibilities: the suction side handy valve might not be closing completely or there could be an actual leak in the spa.

    Does your check valve open for servicing? If so you should open it up and clean out any debris. If it doesn't open, try running the spa for a little while and see if that clears any debris out of the valve. The suction side Jandy valve is fairly easy to check, watch to make sure it stops in the correct positions when switching modes. Actual leaks are more difficult to pin down.
    Thanks Jason, I'll be able to take a look and post pics this weekend. One thing.....the check valve and return Jandy are about waist height, whilst the spa waterfall limit is about mid way between my sole and knee. Could you still get siphoning if the spa is way lower than the Jandy / check valve?

    Thanks

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Spa Waterfall type water loss

    Yes, it can still syphon. The plumbing is all full of water, and the water will flow from higher to lower even if it has to pass through an even higher intimidate location.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Re: Spa Waterfall type water loss

    Problem was bad rubber washer on the end of the spa check valve assy. I got a rubber washer from Lowes for $2 and enlarged the center hole so that it would stretch over the check valve and seat nice and snug. If you have this type of check valve:
    http://www.amazon.com/Pentair-Assemb...pa+check+valve
    and suspect it is allowing water to be siphoned from the spa back into the pool, consider replacing the rubber washer before springing for a $60 replacement valve assy. I'm not seeing what could wear out that easily on the plastic assy.....the washer...yes....the assy itself...? I don't think so. I have replaced this washer before but not because of water siphoning from spa to pool. The pic attached shows the size of washer I used, plus the old one that had compression rings around the outside which was the cause of the leak. I did do a way tidier job this go around in enlarging the center hole. . I enlarged it from 3/4 inch to about 1 1/8 inch to 1 3/16 inch. Lube the washer and valve assy with PTFE lube and gently stretch the washer over the assy and it will seat nicely. Job done and I'm relieved it was a 2 dollar part not a leak in the spa shell!! - Thanks

    can't post pic of washer for some reason. The one I used is 2 1/4 " x 1/8" x 3/4" hole in center.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •