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Thread: cya in pucks

  1. Back To Top    #1

    Join Date
    Jun 2016
    Location
    New Jersey
    Posts
    6

    cya in pucks

    At a pool party this weekend , i was explaining my new found hobby,understanding pool chemistry!
    when a friend said " how many gallons of water would he need to remove from his pool weekly to keep his cya levels the same, using 3 8 oz.pucks weekly?
    I said not sure but I know where to find the answer
    17000 gallon in ground,vinyl, sand filter,New Jersey,in the sun all day,TF100 w/speedstir

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    EVChargeGuy's Avatar
    Join Date
    Jun 2014
    Location
    Long Island, NY
    Posts
    340

    Re: cya in pucks

    I guess one needed piece of data to work this out is how many gallons of water is in his pool?
    IG Tear Drop, Dark Gray Gunite , 27,000 gallons -Age 50+-years, very old Hayward Split Egg Sand Filter with side mount Multi-port- Hayward SP2600VSP Pump- Hayward chlorine feed (not used since finding TFP) - Laars 315K BTU Oil heater- LoopLoc Safety cover- AquaBot RAPIDS 4WD- TF-100 Test Kit w/ Speedstir- 390 Gal Hot Springs Spa Envoy installed May 2017

  3. Back To Top    #3

    Join Date
    Jul 2014
    Location
    Sacramento, CA
    Posts
    240

    Re: cya in pucks

    You can use PoolMath to figure this out: http://www.troublefreepool.com/calc.html

    For example, for a 10,000 gallon pool, under "Effects of Adding Chemicals" selecting 24oz of Trichlor says it will "raise CYA by 10". Then going up to the CYA section, putting current=50 and target=40 gives "To lower CYA you replace 20% of the water".

    The actual percent and number of gallons to replace is going to depend on the size of the pool and the starting CYA level.
    21000gal IG plaster, Sacramento CA area (late 1950s/early 60s)
    Filter: Cartridge, Pentair CCP420 (2014)
    Main pump: Pentair IntelliFlo VS (2015)
    Boost pump: 3/4hp (2011), Polaris 280 cleaner (unknown age)

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    Mr Bruce's Avatar
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    Mar 2014
    Location
    Greenville, SC
    Posts
    1,798

    Re: cya in pucks

    Yep. In Hothead's pool about 25% per week. In my pool, closer to 15% per week, targeting 30. Use pool math to determine how much CYA 3 pucks adds, then use your new "current" and target for water replacement.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  5. Back To Top    #5

    Join Date
    Jun 2016
    Location
    New Jersey
    Posts
    6

    Re: cya in pucks

    Once you explained it to me .its so obvious!!! I felt kind of dumbfounded ....Thanks again
    17000 gallon in ground,vinyl, sand filter,New Jersey,in the sun all day,TF100 w/speedstir

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