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Thread: CH Testing -- Light purple

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    Join Date
    Apr 2013
    Location
    Phoenix AZ
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    20

    CH Testing -- Light purple

    This CH test is driving me nuts, I just can't seem to get it down. I've read the extended kit directions and I believe that I was hitting the fading endpoint so today I just did the alternate method in the footnotes: I got my 25 mL sample, added 5 drops of R-0012 then continued with the remaining steps, added 20 drops of R-0010 then 5 drops of R-0011L and then continued with the R-0012. I got to 40 drops (plus the original 5) and my water turned a light shade of purple. And....according to the extended directions, purple indicates the fading endpoint again. What does this mean?
    ~20,000 gal in-ground plaster pool, 3/4 HP pump, ~3 sqft sand filter (newly replaced May 2013), TF-100 test kit with Speed Stir!

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    Mod Squad jblizzle's Avatar
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    May 2010
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    Re: CH Testing -- Light purple

    I would suggest continuing with the Extended Test Directions to see if that helps:
    In extreme cases, a fading endpoint may occur even when adding five drops of R-0012 at the start. If that happens, mix pool water with an equal quantity of distilled water, test that, and then multiply the result by two.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  3. Back To Top    #3

    Join Date
    Apr 2013
    Location
    Phoenix AZ
    Posts
    20

    Re: CH Testing -- Light purple

    Doh! Guess I missed that part. RTF(ull)M, right?
    ~20,000 gal in-ground plaster pool, 3/4 HP pump, ~3 sqft sand filter (newly replaced May 2013), TF-100 test kit with Speed Stir!

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