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Thread: How to Properly Test CYA

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    Dec 2009
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    How to Properly Test CYA

    I'm having some issues testing CYA with my new TF-100 test kit (first time using). Am I looking for the dot to completely disappear (i.e. no trace of a dot no matter how faint) or am I looking for the dot to change to a lighter shade of gray?

    My other test results are:
    Salt - 2430
    FC - 4.5
    CC - 0.5
    TC - 5.0
    TA - 130
    CH - 150
    CYA - ~23 if you wait until you can't see any trace of the dot
    30,000 Gallon Inground, Vinyl Liner
    DE Filter & Pentair IC40 SWG
    Pentair Legend Platinum w/ PB4 Booster
    Pentair Kreepy Krawler Prowler Robot

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    Mod Squad jblizzle's Avatar
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    Re: How to Properly Test CYA

    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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    Re: How to Properly Test CYA

    Quote Originally Posted by jblizzle
    Thanks - I figured detailed directions were on here, just didn't quite know where to look.
    30,000 Gallon Inground, Vinyl Liner
    DE Filter & Pentair IC40 SWG
    Pentair Legend Platinum w/ PB4 Booster
    Pentair Kreepy Krawler Prowler Robot

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    Richard320's Avatar
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    Re: How to Properly Test CYA

    Bright light is essential. I bought a bottle of the standard solution to check myself, and I'm right on if it's full sunlight and I only hold the tube with my thumb and one finger. Yes, even shading it with all your fingers will make it read different. Plus I take several readings; same solution, just pour it back in the mixing bottle, give it a shake, and repeat.
    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.
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