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Thread: diluting water when testing CYA levels?

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    jgofnj's Avatar
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    diluting water when testing CYA levels?

    I noticed a in another posting, someone suggested diluting the water 50% when testing the CYA levels. Just so I understand, was this to get a more accurate reading? I am assuming because the lines are so close once you past the 60-level range that by diluting your water 50% and then takig the reading and doubling it will get you slightly more accurate reading. Is this the purpose of doing this?
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    Patrick_B's Avatar
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    Re: diluting water when testing CYA levels?

    The reason is for testing when they Cya is over the high range of the test which is 100 PPM Cya. That is the only reason.

    Yes, you can dilute with another source like distilled or tap water as long as it's clear and not turbid at all. Some find it easier to read, but its just a preference for me not too unless the high end range is exceeded. In the case of Cya, it isn't a huge deal like on some tests, but any time you dilute, you lose accuracy.
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    jgofnj's Avatar
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    Re: diluting water when testing CYA levels?

    OK, now I understand, only when your reading is over 100 because that's the highest the marking go. Now that make sense. Thanks for clarifying.
    20,000 gal, In-Ground (built in 2007)
    Vinyl lining / 1HP Hayward SuperPump / Hayward Pro-Grid DE Filter / Hayward Gas Heater / Liquid Chlorine,Bleach (4 Gallon Liquidator)
    Dohney Discovery Robot
    Testing Method: TFTestkits/TF-100

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    Re: diluting water when testing CYA levels?

    The extended test kit directions suggest you use the dilution method when the reading is 90 or higher.
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