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Thread: TF-100 and High Chlorine Test

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    TF-100 and High Chlorine Test

    Yesterday I did a drain/flush on my pool to get the CYA lowered. The good news is I am at least down to CYA of 60 and attempting to go back to bleach instead of trichlor. Last night I added 6 bottles of concentrated bleach in an attempt to shock the pool and get the water clear. I ran the pump all night and attempted to test the water this morning. As I said, the good news is that the CYA is now manageable.

    The bad news is I couldn't get the chlorine test to work. I tried twice. The first test, I added the 870 powder and tried to agitate the test bottle to get it to turn pink. It would flash pink and go back clear. I swirled hard a few more times and it turned a deep purple. So I started adding 871 reagent and got to 60, and still hadn't turned. Then I lost count so I dumped it out.

    I repeated the procedure. This time I added the powder and it never would turn pink. So I added a bit more. After that it turned deep purple again. So I started adding 871 again and got to 100 drops and still no change. It stayed dark purple. I am assuming this means my chlorine level is extremely high? I didn't want to add any more 871 because I am running out of it.

    I then did the chlorine/ph test. (Red and yellow reagents) The chlorine was a dark, dark almost brown again indicating the chlorine level is way high. When testing the pH it was a dark purple 8.2, which has never happened before. My fill water has low pH and I always have to fight to raise it. I am assuming this test was skewed due to the high chlorine???
    10,000 gallon
    Viking Freeform Fiberglass Inground Pool. FNS Plus DE Filter Pentair Challenger .75hp pump


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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: TF-100 and High Chlorine Test

    Yes, Your FC is wa-a-a-ay overdosed. Leave it alone for a few days and it will come down. The pH test is invalid when your chlorine is that high.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: TF-100 and High Chlorine Test

    Cool avatar pic though. ha.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: TF-100 and High Chlorine Test

    I think I had overdosed a bit on cold beer while doing the flush. Guess the pool and I are both a bit hungover today.
    10,000 gallon
    Viking Freeform Fiberglass Inground Pool. FNS Plus DE Filter Pentair Challenger .75hp pump


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