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Thread: main drain?

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    main drain?

    We drained our pool to do an acid wash and filled it back up to just one inch above the main drain cover, but there's no suction from the main drain even though the motor seems to be working perfectly.

    What can be the problem? Does the whole pool need to be refilled before it would work?

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: main drain?

    Does the main drain have a separate line to the pump that can be isolated (i.e. not plumbed through the skimmer)? Also, if the main drain is fairly deep below the pump, the pump will have a hard time priming and pumping. Suction lift is usually limited to less than 8 feet and some pumps have trouble at 6 feet.

    BTW, welcome to the forum.
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

  3. Back To Top    #3

    Re: main drain?

    Thanks for the help, saved us a lot of frustration!

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