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Thread: FC/CC Test Question

  1. Back To Top    #1

    Join Date
    Jul 2008
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    Seacoast, NH
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    FC/CC Test Question

    I've never had this before. When I do the FC test, the sample goes clear for less than a second and then gets light pink again. Do I add more R-0870 or move on to the CC test?

    My current numbers are

    FC 10 (stopping at flash of clear)
    CC 1.5 (doing CC test starting with light pink before adding R-0003)
    pH 7.5 (done yesterday before FC was raised > 10)
    TA 70
    CH 270
    CYA 40-50
    Salt 3250

    FC was raised because I wasn't feeling well yesterday and husband took over and added more bleach than I wanted him to. We hadn't turned on the SWG yet because we just got the salt up high enough today.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    Re: FC/CC Test Question

    If it's just a flash, keep testing. You want it to go clear and stay that way for at least long enough to grab the R-003 and uncap it. I use a speedstir, so I haven't seen that in a while.

    But don't forget, if it turns clear and you set it aside to do something else and a minute later you notice it's pink again, ignore it. That doesn't mean anything.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  3. Back To Top    #3

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    Seacoast, NH
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    Re: FC/CC Test Question

    Ok, thanks. It is just a flash. Will retest.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

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    JoyfulNoise's Avatar
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    May 2015
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    Tucson, AZ
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    11,585

    Re: FC/CC Test Question

    The DPD-FAS test can bleach out if you have high FC and don't add enough powder. What you describe could be not enough DPD powder to react with all of the chlorine. What water sample size were you using and how much powder did you add? I would suggest that you perform the test again but make sure you add two rounded scoops of powder. One way to know if you've added enough is if you see a small number of tiny, undissolved crystals in the solution. That is ok and perfectly normal.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    duraleigh's Avatar
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    Sebring, Florida
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    Re: FC/CC Test Question

    What you describe could be not enough DPD powder to react with all of the chlorine.
    + one to that. I suspect your FC is quite high and you will need two scoops to get the (pool water + R-0870) solution to retain the pink color.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  6. Back To Top    #6

    Join Date
    Jul 2008
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    Seacoast, NH
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    Re: FC/CC Test Question

    I retested and my FC was 12 and CC was 0.

    Tested today and FC was 10 and CC was 0.

    Feeling happy.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

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