Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Problem draining pool, air may be coming in from skimmer?

  1. Back To Top    #1

    Join Date
    Aug 2011
    Location
    San Jose, CA
    Posts
    11

    Problem draining pool, air may be coming in from skimmer?

    I am a new pool owner (just moved) and have been reading this site for some great info.
    The previous owner was using trichlor tabs in a floater, and when I measured the CYA it was >100, so hard to tell actual level as the scale on Taylor kit does not cover the level I see. It may be as high as 200 based on a guess of the level as it seems to be logarithmic but not sure how accurate in that range the kit is.

    I just plumbed in a SWG and hooked up to my timer, but before adding chemicals (salt, borax, acid) I was planning to drain about 50% of my pool. However, I can only drain about 2 feet below my skimmers. Let me give more details about my pool and problem:

    Pool info:
    In ground, guess about 24,000 gallons
    Separate Spa
    Two skimmers
    One pump for filter (DE)
    One pump for polaris pool sweep and I think also connects to skimmers
    Each pump has separate intermatic timer
    Booster for spa (seems to just make air bubbles)
    One main drain in deep end
    Two drains in spa
    Return line to spa separated from return line to pool (valve can select the path)
    Suction line from spa separated from suction from pool (valve can select the path)

    My problem: I cannot drain my pool any more than about 2 feet below my skimmers
    I set my DE filter to backwash, I connect drain hose to this and can drain from there
    First let me may say that my spa can drain perfectly fine, the pump is primed and it drains fast.
    So when setting suction line to come from spa, everything works.
    Now, when I start draining my pool, it works fine until I get below my skimmers.
    When water line gets below skimmers, the pump loses prime, as I see air, but still has enough pressure to continue pumping, albeit at a much, much slower rate. It pumped until the water line was about 2 feet below the skimmers, then it could not pump anymore.
    During this slow pumping phase, I could hear air gurgling from one of the skimmers.
    I am new to pools and did not know there could be any plumbing connection on this skimmer to the main drain, but upon searching I just found it is usually the case.
    So it seems air is getting in through skimmers?
    The skimmers do have diverters.
    On the bottom of the diverter is a small swivel door that can close a hole on bottom, currently they are open.
    I tried closing but does not make a difference.
    Both skimmers have two holes in the bottom below where the diverter sits, both open.
    During the slow pumping phase, one of the holes on both skimmers can have suction when the pump is running, but sometimes water will also squirt out of this hole.
    Also, where the diverter sits on top of the skimmer, there is an O-Ring. On one skimmer, this O-Ring has expanded, it is not making a good seal.
    Where do I buy replacement O-Ring and could this be the problem?
    Should I plug all these holes in the skimmer when draining, if so where is best place to get the plugs?

    Thanks in advance!
    25K gallon in ground

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

    Re: Problem draining pool, air may be coming in from skimmer

    It depends on how things are actually plumbed. If there is a line from the main drain to the equipment pad then all you need to do is plug the skimmers. However if the main drain is plugged into the skimmer, you need a good seal on the o-ring on the diverter and it also helps a great deal to setup a small pump to pump pool water to keep water into the skimmer on top of the diverter.

    You don't need to lower the water level all that much if it ends up being too much trouble. You can simply drain as much as you can easily, then fill it up with fresh water and repeat as many times as needed.
    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

    Join Date
    Aug 2011
    Location
    San Jose, CA
    Posts
    11

    Re: Problem draining pool, air may be coming in from skimmer

    Thanks for the reply.

    The main drain seems to be plugged into the skimmer, as plugging them does not help.

    So now my problem is where do I find replacement O-Ring for my skimmer so my diverter can make a good seal?

    The skimmer is "Hydrotools".
    I did an online search but cannot find this skimmer anywhere, perhaps they no longer make them?
    25K gallon in ground

  4. Back To Top    #4
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: Problem draining pool, air may be coming in from skimmer

    hm. i just did a quick google search for "hydrotools skimmer" and it popped right up!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  5. Back To Top    #5

    In the Industry

    Join Date
    Oct 2011
    Posts
    8

    Re: Problem draining pool, air may be coming in from skimmer

    The proper way to drain a pool is by submersible pump, not your pool equipment.

  6. Back To Top    #6

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Problem draining pool, air may be coming in from skimmer

    Quote Originally Posted by vtwinbarblaster
    The proper way to drain a pool is by submersible pump, not your pool equipment.
    If a pool has no main drain in the floor, then a submersible pump is the way to go. However, if the pool has a drain in the floor and is plumbed in such a manner that permits one to send water to a waste line, then there is no need for a submersible pump.

Posting Permissions

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