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Thread: Help reading CYA test!

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    triplets&quads's Avatar
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    May 2008
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    North Carolina
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    Help reading CYA test!

    When testing my CYA, I am not 100% sure about when I stop seeing that black spot at the bottom of the tube. I think I saw a link to an example/photo of that test on this site. Can someone please help me to understand this test better? I have wasted a lot of this reagent trying to figure out this reading, and I definitely do not want to add CYA if it is not needed. I have been running my chlorine a little higher than 4, but I did not think it was neccessary to run the SWG for as long as I have been, so I turned it down. My SWG recommends 1-3 FC.

    Here are my numbers as of this morning, after a VERY heavy rain last night.

    Temp 85
    Ph higher than 7.5, but lower than 7.8
    FC 4
    CC .5
    TC 4.5
    TA 90
    CYA 40? 50? 60?
    I AM LOVING THE SALT WATER AND THE BBB METHOD! 15 yr old 15,300 gal ABG, with 5 yr old liner, 5 yr old AquaTrol SWG, S220T Hayward Sand Filter, 1 1/2 HP 2 speed Hayward Pump, TF100 Test Kit, 11 yr old grandson, 6 yr old grand-quads AND 4 year old triplet grandsons! ~ I AM HAVING FUN NOW!

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    Jacuzzi 12x24 Oval AG 48" about 7500G
    Jacuzzi Maxiplus 190 sand
    Sta-rite/aquatools 2 speed 1HP (JWP series)
    Intex 8110 SWG

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