Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: CYA test illumination

  1. Back To Top    #1

    Join Date
    Apr 2013
    Location
    Dallas, TX
    Posts
    59

    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

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    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
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    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.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  4. Back To Top    #4
    GoGrabTheNet's Avatar
    Join Date
    Dec 2015
    Location
    Phoenix, AZ
    Posts
    64

    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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •