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Thread: Imprecise CYA Testing/Results

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    Imprecise CYA Testing/Results

    I've been having some issues getting very precise CYA results. I'm using the Taylor test that came with the 2005. After reading the extended test kit directions, the +/- 15 is consistent with what I've been getting, my results are generally 60-70. It just seems like that black dot is always just a bit visible, or I'm just expecting it to be there. Is there any way to squeeze more precision out of this test? =Thanks
    14,125 gallon free form gunnite IGP, Wet-Edge Crystal Coast; 8 foot round spa; Built Winter 2013; Pentair: .5 HP E rated Whisper Pool Pump/2 HP E rated Whisper Spa Booster Pump; Triton II 100 Sand Filter; Master Temp 400 Heater; Intellibrite 5G 2 Pool/1 Spa; Hayward Aqua-Rite w/T-15 SWCG; Polaris 280 w/ booster pump; Taylor K-2005; Taylor FAS-DPD

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    UnderWaterVanya's Avatar
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    Re: Imprecise CYA Testing/Results

    Quote Originally Posted by HouTexYankee
    I've been having some issues getting very precise CYA results. I'm using the Taylor test that came with the 2005. After reading the extended test kit directions, the +/- 15 is consistent with what I've been getting, my results are generally 60-70. It just seems like that black dot is always just a bit visible, or I'm just expecting it to be there. Is there any way to squeeze more precision out of this test? =Thanks
    As far as I know, no. The imprecision isn't important however. I asked nearly the same question in the past and I was assured that there is enough safety margin in the levels recommended to not lose sleep over this.

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    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    JasonLion's Avatar
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    Re: Imprecise CYA Testing/Results

    With practice you can get it down to +-10. There is a CYA standard solution that you can practice with. You can also pour the water sample from the view tube into the dropper bottle and repeat the test several times and see if you can get consistent results.
    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

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    Re: Imprecise CYA Testing/Results

    Thanks guys, after re-reading the extended test kit directions, I am keeping the specimen tube too close to my face during testing. I was peering down into it from about 6-8 inches previously. I will try keeping it at waist level from now on.

    I cannot thank and compliment the folks who post here enough. Tremendous knowledgebase and willingness to share.
    14,125 gallon free form gunnite IGP, Wet-Edge Crystal Coast; 8 foot round spa; Built Winter 2013; Pentair: .5 HP E rated Whisper Pool Pump/2 HP E rated Whisper Spa Booster Pump; Triton II 100 Sand Filter; Master Temp 400 Heater; Intellibrite 5G 2 Pool/1 Spa; Hayward Aqua-Rite w/T-15 SWCG; Polaris 280 w/ booster pump; Taylor K-2005; Taylor FAS-DPD

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    Re: Imprecise CYA Testing/Results

    One more question on viewing:

    I've read that it is best to do this test outdoors with "your back to the sun". With that in mind, should I be viewing the tube in my shadow or in full sunlight. I've found that (obviously) the reading is higher in my shadow and lower with full sunlight hitting the tube.

    Thanks!
    18k(ish) gallon IG plaster/painted "Lazy L" shaped pool most likely built in 1975.
    30" 500lb Hayward sand filter.
    1hp Hayward super2 pump.
    Polaris 9300 Sport Robotic Cleaner.
    TF-100 test kit with speedstir.

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    JasonLion's Avatar
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    Re: Imprecise CYA Testing/Results

    Have the sample tube in shadow. You want very bright indirect light, not direct sunlight.
    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

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    Re: Imprecise CYA Testing/Results

    Yes sir, keeping the test in my shadow did the trick. Also, reading it at waist level and at a slight angle took the reflection of my head out too.

    Thanks again
    14,125 gallon free form gunnite IGP, Wet-Edge Crystal Coast; 8 foot round spa; Built Winter 2013; Pentair: .5 HP E rated Whisper Pool Pump/2 HP E rated Whisper Spa Booster Pump; Triton II 100 Sand Filter; Master Temp 400 Heater; Intellibrite 5G 2 Pool/1 Spa; Hayward Aqua-Rite w/T-15 SWCG; Polaris 280 w/ booster pump; Taylor K-2005; Taylor FAS-DPD

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