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Thread: question about main drain

  1. Back To Top    #1

    Join Date
    May 2009
    Trenton NJ

    question about main drain

    We are going on vacation (in about an hour or so) and I am switching to the main drain and shutting down the skimmer. The problem is, I seem to be getting air bubbles in the basket before the pump, more than usual. The pressure is being maintained but why am I getting air in the system when doing this?

    Thanks, hope to hear from someone
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

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

    Re: question about main drain

    There are a couple of possibilities. Turning off the skimmers increases the suction, which lowers the pressure. Low pressure can allow air to come out of solution, forming small bubbles. The increased suction could also be revealing a small air leak in the plumbing that is normally too slow to be obvious.

    The best plan is to leave both the skimmer(s) and the main drain turned on. If the skimmer(s) get clogged the system will just switch to the main drain automatically.
    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

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