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Thread: Replacing one third of pool water to reduce CYA

  1. Back To Top    #1

    Join Date
    Apr 2007
    Location
    Baton Rouge, La.
    Posts
    75

    Replacing one third of pool water to reduce CYA

    Tomorrow I am replacing a third of the water in my fiberglass pool. A while back someone posted a technique for removing water and filling at the same time. I'll use a sump pump to pump water out and a garden hose to put water back in. I can't remember if they said to put the pump deep and hose at other end of pool at top or vice versa. Anyone remember..
    Trilogy "Fiberglass" Pool,
    15x34 8900 gal.
    Pentair 1hp Super-Flo Pump
    Pentair CC100 Cartridge Filter, Pentair "Legend" Cleaner

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

    Re: Replacing one third of pool water to reduce CYA

    If your fill water is colder than the pool water (common), fill deep and drain high. If your fill water is warmer it is the other way around fill high and drain deep.
    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
    Apr 2007
    Location
    Baton Rouge, La.
    Posts
    75

    Re: Replacing one third of pool water to reduce CYA

    Thanks...That is what I was looking for!
    Trilogy "Fiberglass" Pool,
    15x34 8900 gal.
    Pentair 1hp Super-Flo Pump
    Pentair CC100 Cartridge Filter, Pentair "Legend" Cleaner

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