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Thread: How long for CYA to become effective?

  1. Back To Top    #1

    Join Date
    Jul 2011
    Canton, MI

    How long for CYA to become effective?

    My pool looks great, but it uses about 3.5-4ppm/day of FC. I'm trying to get it down to around 2ppm/day so I'm thinking about raising the CYA. I've done the OCLT many times over the past few weeks, and it always shows no loss of FC overnight and 0-0.5cc, depending on the day. The pool gets full sun for most of the day. I just added 1pound of CYA a week ago, but there was not much change to the daily FC loss. The CYA test shows the level at 35 (exactly between 30 and 40 on the test tube). If I add another pound of CYA this afternoon to bring the CYA level to around 40-45, how long will it take for the CYA to become effective? I know it won't show up on tests for about a week, but is it effective before it shows up on the test? Thanks.

    17,500 gallons, Vinyl, Above ground, Hayward Sand filter, Hayward 1.5hp pump

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: How long for CYA to become effective?

    It depends on your water. Maybe as soon as tomorrow. It works as soon as it dissolves, but it's slow to dissolve in some pools.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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