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Thread: Main Drain Cap

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    Main Drain Cap

    Hi to all;

    My main drain is capped with a spring loaded cap that I was told was to prevent ground water from entering pool. It's actually an equalizer drain to skimmer. I'm aware that a main drain is not necessary, just trying to figure out what I have.

    My question:

    Is this drain still functional and can it be used through the skimmer?

    Thanks in advance!

    Gary R.
    18 X 32 Oval Inground Gunite Pool 20,000 Gallons Epoxy Painted in 2012
    Tagelus Sand Filter TA 60 D/TA 60-Hayward Super Pumps 1 H.P.
    Ray-Pac Heater 266,000 BTU, KLeen Machine Pool Cleaner
    Solar Cover-Rocky's Pool Cover Reel-Intermatic T104R Timer
    TF-100 Test Kit-PoolSkim Skimmer

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    Mod Squad Bama Rambler's Avatar
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    Re: Main Drain Cap

    The spring loaded cap is a hydrostatic valve and it actually allows ground water to enter the pool so that if you drain it, it won't float.

    There is also a pipe ran from the MD to the skimmer. There should be two holes in the bottom of the skimmer. One goes the the MD and the other goes to the pump. You use a diverter (there should be one in the bottom of the skimmer) to adjust how much flow you get from the skimmer and MD. It also shuts off the skimmer if the water level gets too low and draws strictly from the MD.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    Re: Main Drain Cap

    Thanks Dave, I did see on another thread that there may be a diverter with the skimmer but it's missing. I tried running a vac hose between the two port but nothing from the main drain. The pool person pressed down on the hydrostatic valve and it seemed to operate. Also had ran a snake to the main drain as far it would go. It stopped at the hydrostatic valve as best as I could tell.

    Maybe I should just forget it!

    Thanks,

    Gary R.
    18 X 32 Oval Inground Gunite Pool 20,000 Gallons Epoxy Painted in 2012
    Tagelus Sand Filter TA 60 D/TA 60-Hayward Super Pumps 1 H.P.
    Ray-Pac Heater 266,000 BTU, KLeen Machine Pool Cleaner
    Solar Cover-Rocky's Pool Cover Reel-Intermatic T104R Timer
    TF-100 Test Kit-PoolSkim Skimmer

  4. Back To Top    #4

    Re: Main Drain Cap

    Update:

    I did determine that the main drain/equalizer line is clear with a drain king. Blew some debris into the pool.

    New question does the diverter need to be specific to the skimmer brand (Pac-Fab I think) or could I simply run a short 1-1/2" hose between the equalizer line and the skimmer suction port if I wanted to draw from the main drain.

    Thank you!

    Gary R.
    18 X 32 Oval Inground Gunite Pool 20,000 Gallons Epoxy Painted in 2012
    Tagelus Sand Filter TA 60 D/TA 60-Hayward Super Pumps 1 H.P.
    Ray-Pac Heater 266,000 BTU, KLeen Machine Pool Cleaner
    Solar Cover-Rocky's Pool Cover Reel-Intermatic T104R Timer
    TF-100 Test Kit-PoolSkim Skimmer

  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Main Drain Cap

    You could run a short hose but it would work better with the diverter. Your local pool store probably has the diverter you need in stock.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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