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Thread: Lowering CYA

  1. Back To Top    #1

    Join Date
    Jun 2012
    Location
    Howard City, MI
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    54

    Lowering CYA

    I just tested my CYA and it is currently 50. The pool calculator recommends draining 20% of pool water. How do I go about doing that? Can I just open plug and drain into yard?
    Above-Ground Pro Series 18'x48" Metal Frame - Approx 6,450 gallons
    Skimmer Filter System (cartridge): SFS1000 w/ F1500C Pump: 120watts/2.0amps/1500g.p.h
    Purchased & Installed: 6/7/12 (week of)

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    Join Date
    Jun 2011
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    Long Beach, CA
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    2,670

    Re: Lowering CYA

    Your CYA of 50 is recommeded for most outdoor pools. Is there a reason you want to lower it?
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

  3. Back To Top    #3

    Join Date
    Jun 2012
    Location
    Howard City, MI
    Posts
    54

    Re: Lowering CYA

    No, I just wasn't sure if I needed to or not. The CYA test can be a little tricky for someone with terrible eyes. At first I thought my reading (the black dot started to disappear from top view) was 80, but as I continued to add drops I realized my first reading may not be right.

    This is my least favorite test and hard for me to read.
    Above-Ground Pro Series 18'x48" Metal Frame - Approx 6,450 gallons
    Skimmer Filter System (cartridge): SFS1000 w/ F1500C Pump: 120watts/2.0amps/1500g.p.h
    Purchased & Installed: 6/7/12 (week of)

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
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    May 2010
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    Tucson, AZ
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    37,389

    Re: Lowering CYA

    Further info on the CYA test (and the others), if you have not seen it:
    extended-test-kit-directions-t25081.html#p206397

    Note that the lighting is quite important for the CYA test.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    18,768

    Re: Lowering CYA

    If that's all you can find wrong with your water, leave it alone!

    http://tftestkits.net sells a standard solution for the CYA test. It is a known 50ppm solution that you use in place of pool water in the CYA test to check yourself. Then you can experiment with the lighting, how far to hold it, etc etc until you know what to do to get an accurate reading.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  6. Back To Top    #6

    Join Date
    Jun 2012
    Location
    Howard City, MI
    Posts
    54

    Re: Lowering CYA

    Thank you to all for your help. couldn't do it without you.
    Above-Ground Pro Series 18'x48" Metal Frame - Approx 6,450 gallons
    Skimmer Filter System (cartridge): SFS1000 w/ F1500C Pump: 120watts/2.0amps/1500g.p.h
    Purchased & Installed: 6/7/12 (week of)

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