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Thread: Sample location

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    tcat's Avatar
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    May 2012
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    Austin, TX
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    Sample location

    I shocked last week and all is well (I believe). I just checked my FC and it was 3.5 with cc of 1. Then I pulled a sample about 10' from first one and got FC 5.5, CV <.5 (about 2 minutes later). Both about 15"deep. Pool is running on low speed, but getting good rotation. Are such extreme results normal? CYA 40.
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    duraleigh's Avatar
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    Re: Sample location

    Quote Originally Posted by tcat
    I shocked last week and all is well (I believe). I just checked my FC and it was 3.5 with cc of 1. Then I pulled a sample about 10' from first one and got FC 5.5, CV <.5 (about 2 minutes later). Both about 15"deep. Pool is running on low speed, but getting good rotation. Are such extreme results normal? CYA 40.
    All is NOT well and you should never get results like that.

    Turn your pump to high for 30 minutes and repeat those test....samples from anywhere...it won't matter.

    Be very sure you are taking the FC test and the CC test to their correct conclusion......the last drop shows ABSOLUTELY no further color change and then you subtract that last drop......for both tests.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    tcat's Avatar
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    Austin, TX
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    Re: Sample location

    OK, got 6 with cc less than. 5. I stop when liquid goes clear, why would you add another drop just to subtract it? Can't get any clearer than clear. I knew I couldn't have 3.5 since my auto feed added 32 ounces in 12 hours, usually a bit more than needed to hold at 5 or 6, and it's fed at the pump, so should be mixed well coming out of all 4 jets.
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    Join Date
    Jul 2013
    Location
    Columbus, Ohio
    Posts
    114

    Re: Sample location

    Quote Originally Posted by tcat
    OK, got 6 with cc less than. 5. I stop when liquid goes clear, why would you add another drop just to subtract it? Can't get any clearer than clear. I knew I couldn't have 3.5 since my auto feed added 32 ounces in 12 hours, usually a bit more than needed to hold at 5 or 6, and it's fed at the pump, so should be mixed well coming out of all 4 jets.
    The extra drop is to make sure that clear is really clear. I have seen samples look clear looking through the vial from the side but look slightly pink when viewed from above.
    16,500 gallon, 18" x 38" Grecian; IG Vinyl, Hayward DE

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