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Thread: CYA test illumination

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    Join Date
    Apr 2013
    Dallas, TX

    CYA test illumination

    I know you're supposed to do it in full sunlight, with your back to the sun and held at waist level, but one thing I was wondering the other day, should the tube be in the shadow of your body or be illuminated by the sun? Also, you mention holding it differently changes things - what's the best way to hold it?
    ~15k gal IG pebble pool/spa w/ water features, Goldline ProLogic + SWG, 2x Hayward Northstar pumps, Hayward Booster Pump, Hayward 60sqft DE filter, 400k BTU Hayward heater, Hayward Viio Turbo pool cleaner, TF100 test kit

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

    Re: High cya level

    It should be in your shadow. I hold it with 2 fingers at the top of the tube.
    Jason, TFP Moderator
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  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: CYA test illumination

    The important thing s that it be very bright yet not have the sun reflecting off the surface in the view tube. I do it on the patio so there's all that light reflecting off the concrete and I hold it at the very top with just thumb and forefinger.

    Just keep pouring it back into the mixing bottle and repeating it.
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    GoGrabTheNet's Avatar
    Join Date
    Dec 2015
    Phoenix, AZ

    Re: CYA test illumination

    Bumping this old thread to check in to see if anyone has a more "controlled" method of checking the tube. If I perform the test in my kitchen which has nice-and-bright recessed light fixtures, then I get very close to, if not the same reading, compared to when I do it in sunlight.
    13k Gal. PebbleTec IG pool : Pentair IntelliFlo VS pump : Hayward 8-cartridge filter system : A&A in-floor cleaners : Jandy 115k BTU heat-pump : A&A auto-filler : Stenner 45MPHP10 auto-chlorine feeder : BBB Method

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