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Thread: CYA High

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    Join Date
    May 2010
    Location
    St. Louis, Mo.
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    CYA High

    My CYA is at 100. The pool calculator says to replace 60% of my pool water to get at a 40 reading. I have a 14,000g fiberglass pool that I have never drained before, except for your basic backwash. Do I drain all at once or a little at a time? Will the pressure from draining all at once crack the fiberglass. Or should I drain it 40% to get a reading of 60?
    Grecian/W a Step style,14ft by 30ft
    14,000 gallon,Fiberglass,
    Sand Filter
    Deepend 5ft
    Method(BBB)

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    Mod Squad Bama Rambler's Avatar
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    Re: CYA High

    Since most CYA tests only read to 100 and report anything higher as 100, yours could be higher than that. In St. Louis and with a fiberglass pool I wouldn't drain more than a third of your water at one time. You may have to do several drain/fills to get the CYA down.
    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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    May 2010
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    St. Louis, Mo.
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    Re: CYA High

    Thanks for the reply. Everything else is pretty good. my water is very clear. So should I concentrate on not adding other chemicals until i get my CYA right?
    Grecian/W a Step style,14ft by 30ft
    14,000 gallon,Fiberglass,
    Sand Filter
    Deepend 5ft
    Method(BBB)

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    Melt In The Sun's Avatar
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    Oct 2009
    Location
    Tucson, AZ
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    Re: CYA High

    You'll want to make sure to keep chlorine in it so it doesn't turn green. It may take a while to do multiple partial drains, and you don't want to get algae during that time!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  5. Back To Top    #5

    Join Date
    May 2010
    Location
    St. Louis, Mo.
    Posts
    16

    Re: CYA High

    This is probally a silly question. should set my pump at 6 o'clock until the water gets below the skimmer and then set to 9 o'clock so it only drains from the bottom. I feel retarded asking but I never done this before? Or would that be too much draining at one time.
    Brett
    Grecian/W a Step style,14ft by 30ft
    14,000 gallon,Fiberglass,
    Sand Filter
    Deepend 5ft
    Method(BBB)

  6. Back To Top    #6
    Melt In The Sun's Avatar
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    Oct 2009
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    Tucson, AZ
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    Re: CYA High

    Just set it to only drain from the bottom. Otherwise you'll suck air and lose prime as soon as the water level gets below the skimmer.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  7. Back To Top    #7
    Mod Squad Bama Rambler's Avatar
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    Re: CYA High

    Sounds like you ahve a 3-way valve to select between the skimmer and the Main Drain. I'd set it to pull from the main drain during the whole time I was lowering the water level.

    MITS -- GMTA
    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

  8. Back To Top    #8

    Join Date
    May 2010
    Location
    St. Louis, Mo.
    Posts
    16

    Re: CYA High

    I will start doing this today when I get home from work. I do have a 3-way valve. Thanks alot for all your help.
    Brett
    Grecian/W a Step style,14ft by 30ft
    14,000 gallon,Fiberglass,
    Sand Filter
    Deepend 5ft
    Method(BBB)

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