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Thread: Dichlor and CYA

  1. Back To Top    #1

    Join Date
    May 2007
    Location
    Shepherdsville, KY
    Posts
    21

    Dichlor and CYA

    Good afternoon all! I read it somewhere on this forum or on the PS Forum but now I can't find it.....How much CYA is put into the pool when you use Dichlor? Right now I have no CYA in the pool and I need to shock it, so I figured I would kill two birds with one stone
    33' x 54" AG 29,000 gal, 1.5 HP Hayward Pump, Cartridge Filter, Pool Rover Robot, devoted follower of the BBB method!

  2. Back To Top    #2

    Join Date
    May 2007
    Location
    Houston, Texas, USA
    Posts
    148
    I'm not really positive, but I think 16 oz of dichlor would increase cya by 8 ppm. So basically .5 ppm cya per ounce of dichlor.
    Poor Man's Pool
    Doughboy 18 ft round above ground
    7600 gal with center drain
    Pentair sand filter, 1 HP pump
    50 ppm borates
    "I know just enough to be dangerous"
    Pool Calc Ver 1.41 (Excel)

  3. Back To Top    #3

    Join Date
    May 2007
    Location
    Shepherdsville, KY
    Posts
    21
    Thanks for the quick reply Poseidon!
    33' x 54" AG 29,000 gal, 1.5 HP Hayward Pump, Cartridge Filter, Pool Rover Robot, devoted follower of the BBB method!

  4. Back To Top    #4

    Join Date
    May 2007
    Location
    Montreal Canada
    Posts
    326
    Dichlor is 57.3% stabilizer and 64.4% chlorine (sort of), so for a 37854 liter pool (10000 gallons) adding say 260 grams (9.17 ounces) introduces:

    (260 * 0.573) / (37854 / 1000) = 3.94 ppm stabilizer

    and

    (260 * 0.644) / (37854 / 1000) = 4.42 ppm chlorine

  5. Back To Top    #5
    Guest
    For each 1 ppm of chlorine you add with dichlor you are also adding .9 ppm CYA. (Close enough for Government work! )

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