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Thread: Pool drain clog issue (maybe)

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    sonflower's Avatar
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    Pool drain clog issue (maybe)

    We think we may have cloggage issues.

    Last night when draining the pool (sigh) the output water pressure coming from the blue hose was nothing like it used to be.

    Hubby thought maybe the pool drain is clogged?

    I said with all the dust storms from spring, perhaps so.

    Any thoughts on this?

    Also if it is clogged, how to unclog? Sure would be nice if it were as simple as putting the vacuum cleaner on top of the drain and letting it sit there suctioning all that dirt up.

    Thanks in advance, again!
    Pool: (2003) IG Plaster 14,209 gallon (Water Surface 421 sq. ft.) ~ Spa: 18" raised kidney
    Triple spillway (Waterfall) ~ With 6' slide ~ Hayward's Goldline Controls Aqua Rite Digital Electronic Chlorine Generator (Salt System) ~ 40K Salt Cell ~
    ~ AquaLink RS -4 ~ Purex Whisper Flow 2 HP~ Aquatech 60 sq. ft. DE Filter Normal Pressure 22 # ~ MiniMax NT (Propane) Heater 400,000 BTU ~ Jandy Valve Actuator ~Letro Legend Cleaner ~ K-2006 & K-1766 Test Kits

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    Mod Squad Bama Rambler's Avatar
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    Re: Pool drain clog issue (maybe)

    If it's a gravity drain, it could be clogged with dirt, etc. If it's the main drain it still could be clogged but less likely. You could use a drain king to put pressure back through the piping and see if anything comes out of it.
    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
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    Re: Pool drain clog issue (maybe)

    Can you set the MPV on circulate and switch between skimmers and the main drain? Try that and compare pressure out the returns. If both are the same, and less than normal, problem is more likely in the pump (clogs or other problem with impeller.) Also verify that no water is coming out blue tube when on Filter or Recirc. This would indicate an MPV problem such as a spider gasket issue that could cause this. It's hard to plug a main drain if you don't have a layer of crud in the bottom of the pool, which I assume you do not have, or you would have mentioned it. I admit I know nothing about this Texas dust that folks down there talk about, but I wouldn't think it could plug a floor drain against 2hp.

    A 2HP Whisperflo should be able to suck a 15K pool dry real fast.
    Current: 28,000G 18'x36' I/G AnthonySylvan Plaster; Waterway 60 sq.ft. DE Filter; 1.0hp x 1.65 SF Two-Speed (B2982) WhisperFlo; 2004-Present
    Previous: 40,000G 20'x40' I/G Koven unlined WWII salvage 5/8" marine steel; Lomart Stainless Sand Filter; 3/4hp Hayward SuperPump; 1946-2003 (managed by me from about 1964)
    Ancient Taylor K-2000, upgraded with Taylor CH, TA, and FAS-DPD, and TFT CYA tests.

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    Mod Squad JohnT's Avatar
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    Re: Pool drain clog issue (maybe)

    How low were you draining? Just getting rid of rain water, or below the skimmers? As the water level drops, the pump will move less water, and most pumps can't even pump water a couple of feet below the skimmers.
    TFP Moderator
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    Re: Pool drain clog issue (maybe)

    Quote Originally Posted by Durk
    Can you set the MPV on circulate and switch between skimmers and the main drain? Try that and compare pressure out the returns. If both are the same, and less than normal, problem is more likely in the pump (clogs or other problem with impeller.) Also verify that no water is coming out blue tube when on Filter or Recirc. This would indicate an MPV problem such as a spider gasket issue that could cause this. It's hard to plug a main drain if you don't have a layer of crud in the bottom of the pool, which I assume you do not have, or you would have mentioned it. I admit I know nothing about this Texas dust that folks down there talk about, but I wouldn't think it could plug a floor drain against 2hp.

    A 2HP Whisperflo should be able to suck a 15K pool dry real fast.
    in total agreement....if flow is consistent regardless of setting you most likely have and issue listed above or are taking in air somewhere due to a faulty gasket.


    I'm not a big fan of using the pool equipment to drain the pool for those exact reasons...severe damage can occur.... has anyone suggested renting a submersible pump from home depot or a similar tool rental place?
    http://www.californiapoolsdirect.com serving Dallas pools since 1953!

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    Re: Pool drain clog issue (maybe)

    Quote Originally Posted by JohnT
    How low were you draining? Just getting rid of rain water, or below the skimmers? As the water level drops, the pump will move less water, and most pumps can't even pump water a couple of feet below the skimmers.
    I thought that was the advantage of a pump designed specifically for IG pools, that it could self prime and pull from well below the pump's level?

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    Re: Pool drain clog issue (maybe)

    Quote Originally Posted by JohnT
    How low were you draining? Just getting rid of rain water, or below the skimmers? As the water level drops, the pump will move less water, and most pumps can't even pump water a couple of feet below the skimmers.
    Good point. I assumed OP was just draining excess rain water. If system is airtight, one or two feet won't make much difference. But if skimmers go dry and you are trying to go real low, you are sucking air even if the skimmer is off. You can try the old run a slow hose into the skimmer trick to try and maintain prime if that is the case. Air in the pump chamber is another clue you should look for.

    With galvanized pipes and brass gate valves, I could suck all 40K gal down to 10' out of my old pool as long as I didn't stop. I haven't tried the new one with all this plastic junk .
    Current: 28,000G 18'x36' I/G AnthonySylvan Plaster; Waterway 60 sq.ft. DE Filter; 1.0hp x 1.65 SF Two-Speed (B2982) WhisperFlo; 2004-Present
    Previous: 40,000G 20'x40' I/G Koven unlined WWII salvage 5/8" marine steel; Lomart Stainless Sand Filter; 3/4hp Hayward SuperPump; 1946-2003 (managed by me from about 1964)
    Ancient Taylor K-2000, upgraded with Taylor CH, TA, and FAS-DPD, and TFT CYA tests.

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