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Thread: Phenol Red....

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    Phenol Red....

    Or should I say not so.

    Just curious if anyone here has ever experienced the Ph test not being any red that matches
    any of the colors on the test tube.
    I use a K-2006 Taylor test kit and sometimes the red doesn't match the color it is closest too.
    Example - for 7.4 result, the tested pool sample is a deeper shade of the red in that field. It isn't
    orange enough to be 7.2 and it isn't pink enough to be 7.6 but it also doesn't match the 7.4,
    But it is 7.4. I have looked through it to different light sources and different backgrounds, but no matter what
    it just doesn't match. I was just curious if there may be something present in the water
    to have that affect on the test..... OR I am just going color blind!


    anyway if anyone has experienced something similar or knows a possible reason behind it, Thanks for sharing.

    PF
    The Most Interesting Pool Man in The World
    I don't always have clients that want to maintain their pool,
    but when I do, I send them to troublefreepool.com!

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    JasonLion's Avatar
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    Re: Phenol Red....

    There is a unique purple color, not in any of the color samples, when the FC level is around 20+. But that doesn't sound like what you are describing.

    The color never exactly matches any of the color samples, unless you are using liquid color references (which exist, though they cost so much no one uses them). But it should be close enough to make the comparison obvious enough.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Phenol Red....

    You sorta' answered your own question...
    .It isn't orange enough to be 7.2 and it isn't pink enough to be 7.6 but it also doesn't match the 7.4, But it is 7.4.
    Yep, your pH is 7.4, exactly because of your description eliminating 7.2 and 7.6
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Phenol Red....

    I trust my readings of the redness, I was just curious if anyone knew if there was something present in the water that may make it look a deeper red
    than it should for that field.

    ...just curious(probably just over thinking it)

    Thanks again
    PF
    The Most Interesting Pool Man in The World
    I don't always have clients that want to maintain their pool,
    but when I do, I send them to troublefreepool.com!

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    Mod Squad jblizzle's Avatar
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    Re: Phenol Red....

    You could try using one less or one more drop and see if that helps the color matching.
    Jason, TFP Moderator
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    Re: Phenol Red....

    Does the pH reading change if you have an extra drop?

    So, the number of drops,5-6, is not critical?
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Re: Phenol Red....

    Yes that is correct, the number of drops is not critical. I usually don't use 5 drops in my K-2006 pH test because the result is too dark and saturated compared to the reference colors. 3 or 4 drops works much better in my case. So try adding 1 fewer drop if your result is too dark and saturated or add 1 more drop if it's too light and less saturated than the reference. What you want to be comparing is the hue, not the lightness or saturation.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: Phenol Red....

    INTERESTING. I have retested if I thought I had too many drops.

    Is the OTO test the same way? I sometime get those little baby drops. Wish I would stop making them.
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Re: Phenol Red....

    Yes, the OTO test will be the same hue regardless of the number of drop, only the saturation will vary.
    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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