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Thread: Unusual Test Results - No CYA?

  1. Back To Top    #1
    New2water's Avatar
    Join Date
    Jun 2011
    Stockton, CA

    Unusual Test Results - No CYA?

    Tested the pool for the first time this season using the new chemicals refill kit. Something is not right because I haven't seen this kind of results previously.

    pH: 8.2+
    T/A: 200
    FC: 0
    CC: 0
    CYA: 0

    I'm wondering if the refill kit is problematic or is it the few rains we had in this part of parched California a few months ago.
    The pool calculator suggests adding 270 Oz Liquid Chlorine, 60 Oz Muriatic Acid and 80 Oz Stabilizer. Do that seem the right way to go?
    18K gal in ground, Plaster, three 1 HP WhisperFlo WFE-4 pumps (Pool, Hot Tub, Waterfall), 320 sq ft cartridge filters, MiniMax Plus HP 400 heater, TF-100 test kit, Kreepy Krauly Classic cleaner

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    TFP Guide
    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Greenville, SC

    Re: Unusual Test Results - No CYA?

    It's possible the CYA went away without the rain. Mine was gone, it's been suggested that it turned to ammonia and then to nitrogen (I think).

    Are you intending to SLAM or jumping into maintenance mode?
    35K gallon Krystle Krete (Plaster) - Sand Filter - TF100
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Unusual Test Results - No CYA?

    You should do the ammonia test ...
    Add 10ppm of FC with bleach, then test the FC and CC after 10-15 minutes.
    Post back.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  4. Back To Top    #4
    Donldson's Avatar
    Join Date
    Jun 2009
    NW Ohio

    Re: Unusual Test Results - No CYA?

    Quote Originally Posted by jblizzle View Post
    You should do the ammonia test ...
    Add 10ppm of FC with bleach, then test the FC and CC after 10-15 minutes.
    Post back.
    +1 to this, your results match what an ammonia conversion would look like. Don't add any stabilizer until you either rule out ammonia or find and remove it.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter.
    Pool School - PoolMath - HIGHLY Recommended Test Kits

  5. Back To Top    #5
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: Unusual Test Results - No CYA?

    Since this is your first time opening and there may be a concern for ammonia in the water, please do the following:
    *** (FIRST) - Lower pH to 7.2-7.5. Test about 15 minutes after adding acid with pump running to ensure you have reached your target or repeat as necessary)***
    1. Begin a SLAM and dose FC up to SLAM level. If your CYA test is showing as zero (perhaps already converted to ammonia), use a SLAM/Shock FC of 10. Do not add additional CYA at this point.
    2. Retest FC at 10-minute intervals.
    a. If FC loss is greater than 50%, add FC to bring back up to SLAM level and continue retesting FC @ 10-minute intervals.
    b. IF FC loss is 50% or less, add FC to bring back up to SLAM level. Go to Step 3.
    3. If CYA is below 30 ppm, add enough CYA to bring level up to 30 ppm.
    4. Continue SLAM as directed in the SLAM article until the SLAM Criteria of Done are met. Test as directed in the SLAM article - no longer need to test FC at 10 minute increments at this point.

    If there is ammonia, the FC every 10-min will take care of it. If there's not, you'll soon finish this and be on your way to a regular "SLAM" (link below) to ensure the water is free from organics.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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