Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: CYA Test

  1. Back To Top    #1

    Join Date
    Oct 2008
    Location
    Yuma, AZ
    Posts
    33

    CYA Test

    The only dumb question is one that is not asked. Therefore ... the following:

    The same chemicals are used in the Lamotte "black dot" CYA test and my brand new TF100 test kit. However the instructions to mix are different. Lamotte "black dot" CYA test says to shake the mixing vial for 1 minute, let set for 3-5 minutes, shake once, and then read in the viewing tube. TF100 says to mix, wait at least 30 seconds, shake once more and then read in the view tube.
    I am a recent convert to the TF100 and am having difficulty with the CYA "black Dot" test. I am following the TF100 instructions but have always had trouble with the "black dot" test.

    Question: Are the TF100 instructions all I need (except experience) to conduct a reliable CYA "black dot" test?
    14,000gal IG Fiberglass pool with 850 gal spill over spa, Whisper Flo 1hp pool pump, Whisper Flo 2hp spa pump, DE filter, Zodiac Clearwater LM3 SWG, "Heat Siphon" Model SX5HP pool/spa heater, a water leveler and a Kreepy Krauly cleaner

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: CYA Test

    This has a lot to do with water temperature. Cold water takes longer to react, so it needs more time to sit before you read the test. If the water sample is nice and warm, the TF100 directions are fine. But if the water is cold, the Lamotte directions make more sense.

    What I do is: if the water is below 70 degrees I warm the sample up to indoor room temperature first, mix for 30 seconds, leave sitting for 2 minutes, shake for 10 seconds, read the result.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    Oct 2008
    Location
    Yuma, AZ
    Posts
    33

    Re: CYA Test

    Jason,

    Thanks ... water is 86 degrees so TF test is what I will continue to go with.

    Another question (I'm new ... not sure this is the correct way to ask)

    My new TF test kit says just to add the drops for the calicum hardness test ... no instructions to swirl or mix. Is this correct?
    14,000gal IG Fiberglass pool with 850 gal spill over spa, Whisper Flo 1hp pool pump, Whisper Flo 2hp spa pump, DE filter, Zodiac Clearwater LM3 SWG, "Heat Siphon" Model SX5HP pool/spa heater, a water leveler and a Kreepy Krauly cleaner

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: CYA Test

    On the calcium test you add R-0010 and swirl to mix, add R-0011L and swirl to mix, then add R-0012 one drop at a time swirling to mix for several seconds (5 to 30 seconds) after each drop. Mixing longer after each drop of titrant makes the results more reliable and avoids fading endpoint problems.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5
    Guest

    Re: CYA Test

    I do the CYA test following the LaMotte directions no matter what the temp. I also recommend swirling after each drop of titrant in the CH test for at least 20 sec. or using a magnetic stirrer.

Posting Permissions

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