Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: No luck with CYA testing - help!

  1. Back To Top    #1

    Join Date
    Jun 2014
    Location
    Houston, TX
    Posts
    12

    No luck with CYA testing - help!

    I obviously cannot tell when the dot disappears. I get readings anywhere from 70 to 120, a big difference. I have looked at the Taylor pictures but I still cannot tell.
    10000 gallon in-ground, kidney-shaped, plaster pool built in 1965. Original Nautilus NS-24 fDE filter, replacement Hayward RS 750 pump. Located in Houston, TX

  2. Back To Top    #2
    northrn's Avatar
    Join Date
    May 2014
    Location
    Cincinnati, OH
    Posts
    532

    Re: No luck with CYA testing - help!

    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

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

    Re: No luck with CYA testing - help!

    That's normal.

    The lighting can make a HUGE difference. For me, even whether I hold the tube with 4 fingers touching or just dangle the view tube between my thumb and forefinger makes a difference. So does any sun reflection off the surface. It's also possible you're getting memory vision optical illusions.


    Stare at this for a minute - the haze will disappear.

    Try looking away for a minute.

    There's no shame in taking multiple readings. When I started, it would take me maybe 12 tries to get three readings within 5 of each other. Take a reading, pour it back and swirl it, take another reading. Repeat. If it takes twenty, who cares? No one's timing you.
    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

    Join Date
    Aug 2012
    Location
    Fort Worth, TX
    Posts
    83

    Re: No luck with CYA testing - help!

    Get a bottle of 50 ppm standardized solution
    http://tftestkits.net/R-7065-CYA-Sta...ution-p34.html

    Use this as though it was pool water and set the test up.
    Fill the test vial with the dot to the 50 mark.
    Stand and look down as you raise and lower the test vial until the dot disappears.
    Wherever the dot first disappeared, look at exactly where the vial was in relation to your torso.
    It may be at waist level, chin level or anywhere between when this happens- it all depends on the lighting and your eyesight.
    Now, test your pool water in the same lighting holding the test vial in the same location.
    You will get a reading you can trust.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

  5. Back To Top    #5

    Re: No luck with CYA testing - help!

    Three things that I've found can help:

    1. If you wear glasses, wear them when doing the CYA test, and hold the vial at whatever distance your glasses let you focus best.

    2. Keep the bottom of the vial moving slightly. It is easier to see (or not see) the dot if it is moving. If you hold the vial completely still, your eye will get a "burn-in" of the image, and it will be difficult to tell if the dot is visible or if you're just seeing a left-over shadow of the dot on your retina.

    3. If you have some extra cash, you can get the Pentair Cyanuric Acid test kit. There's still a black dot you have to look for, but it is on a slider that you can move up and down through the solution until you narrow down the exact spot that it disappears. It works faster and more accurately than the one in the Taylor or TF test kits. It uses more reagent, but it is the exact same reagent that the Taylor uses, which is fairly cheap when you buy it in the 16oz bottles.
    Last edited by TomBorg; 07-05-2014 at 01:21 AM. Reason: forgot one
    25000-gallon semi-public IG concrete/plaster pool, Triton II sand filter
    750-gallon semi-public IG concrete/plaster spa, cartridge filter
    Volunteer pool caretaker for my condominium complex

  6. Back To Top    #6

    Join Date
    Aug 2012
    Location
    Ellington, CT
    Posts
    243

    Re: No luck with CYA testing - help!

    Quote Originally Posted by TomBorg View Post
    3. If you have some extra cash, you can get the Pentair Cyanuric Acid test kit. There's still a black dot you have to look for, but it is on a slider that you can move up and down through the solution until you narrow down the exact spot that it disappears.
    You can get a test cylinder with a slider from Taylor, PN 4088. https://www.taylortechnologies.com/p...entPartID=2011

    One method that I use is to fill to a line, say for example 40 ppm, and check for the dot. If I can still see it then I add more solution to the next line, 30 ppm, then check again, I continue to do this until I have the it bracketed between two lines, one where i can still see the dot, the other where I cannot. Using this as an example if I can see the dot at 40 and not see it at 30 then I just call it 35 ppm. I know its not linear between lines, but its close enough. If say in this case that it somewhat questionable that I can see the dot at 30 ppm, then I would just call it at 30 ppm. So I end up with cya readings with resolutions at 5 ppm. Of course this is all done following the recommended procedures.
    30,000 gal, 20 x 40 ft vinyl, IG, installed 2006
    1 HP WhisperFlo pump, 60 sqft Pentair Quad D.E., Liquidator(8 gallon) with 3/8 upgrade,TigerShark cleaning robot
    TFTestkits TF-100 with SpeedStir,WS
    A proud practitioner of TFP since 2013

  7. Back To Top    #7
    donniespool's Avatar
    Join Date
    Nov 2013
    Location
    Tucson
    Posts
    31

    Re: No luck with CYA testing - help!

    I am happy to learn that I am not the only one who goes crazy testing cya..It seems like so many factors can/do come into play during the process..
    in ground gunite/plaster 16x30..3-6-3 play pool, sand filter, 1 hp pump..single speed... built in 77 replastered in 05
    15300 gallons. chlorine tabs no longer...tf-100 test kit

Posting Permissions

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