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Thread: need help with reading FC test

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    need help with reading FC test

    Started baquacil to chlorine conversion last night, added 3 gallons of bleach initially, then another 1 1/2 gallons after 1 hour, then another after one more hour. No colors, since we hadn't added any chemicals since the fall. Right now, water just looks cloudy, kind of milky. When I do the chlorine test, do you add a drop, swirl, and count the result right then? It got clear but then went back to pink when I stopped swirling after 5 drops last night, and after 2 drops this morning. Do I keep adding drops until it stays clear after you stop swirling? Or, do I count them as soon as the water clears while I'm swirling it?

    I have a 15' round, 4' deep above ground pool, calculator says 5300 gallons for that size. Thanks!
    15' round AG Trevi, 1.5 hp Hayward Matrix Powerflo, 200 SF Waterway cartridge filter

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    Richard320's Avatar
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    Re: need help with reading FC test

    It's not unusual for it to go clear and then revert to pink a minute later. Ignore that second stage. Just be sure to mix thoroughly with each drop. It will get pale, then clear. If it stays clear for more than 10 seconds, that's your reading.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    frustratedpoolmom's Avatar
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    Re: need help with reading FC test

    If it turns back to pink after a few seconds you aren't done counting drops. If it turns pink after say a minute - don't count that.
    Helpful links: Pool School; CYA/Chlorine Chart
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    pool is still cloudy

    This is day 6 of our conversion, and our pool is still cloudy. We started Monday night, have added lots of bleach. The FC gets up to 17 at night, then in the morning is down to 11 or 12 the last two mornings. Initially, our ph was fine and now it reads 6.5. Could the bleach be lowering our ph? We have very soft water with a normally high ph which needs the muriatic acid to keep it down. When we took the cover off, we got a lot of leaves and dirt into the pool. After daily vacuuming, it's now clean, but still cloudy. I just tested:

    FC 1
    CC 2
    PH 6.5
    CL .5 This is from the tester in the blue box.

    What do I need to do? 15' round above ground. Our water ph is just normally so high I hesitate to add anything to raise it.

    Thanks,
    brisketbabe
    Trenton, TX
    15' round AG Trevi, 1.5 hp Hayward Matrix Powerflo, 200 SF Waterway cartridge filter

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    JasonLion's Avatar
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    Re: need help with reading FC test

    Do you have a test result for TA?

    It is unusual for the PH to go down that much, normally it drifts up a little. The PH and TA should be adjusted to be back in range, PH between 7.2 and 7.4, and TA between 60 and 150, before continuing.

    One of the most interesting numbers at this stage is how much chlorine you are losing overnight. That will give you a good idea of where you are in the process.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  6. Back To Top    #6

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    Re: need help with reading FC test

    We added 1 1/2 gallons of bleach last night, water is clean but still cloudy. Here's this morning's numbers:

    ph 6.5
    ta 240 This from a test strip
    fc 6 Last night was 17
    cc 2 same as last night

    calcium is 0, we have very soft water and haven't added any calcium

    Should we add borax to get the ph up? Just seems weird, it's always been high and we haven't added any
    muriatic acid since we uncovered the pool When we uncovered, ph and ta were both in the okay range on
    the test strip. Now, ph is low and ta is way high. Haven't added any bleach yet today, wanted to check
    with you first to see what I should do.

    Thanks!
    15' round AG Trevi, 1.5 hp Hayward Matrix Powerflo, 200 SF Waterway cartridge filter

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    JasonLion's Avatar
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    Re: need help with reading FC test

    With TA that high, there is no way PH would have gone down like that. I'm inclined to suspect some kind of problem with the PH test result.
    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

  8. Back To Top    #8

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    Re: need help with reading FC test

    Well, I wondered about the test strips being old, or something, but last night when I used the blue box kit with the ph side to test, it showed 6.5, same as the test strip, so I figured they were okay, but I'll retest the TA at lunchtime with the testing kit liquid.
    15' round AG Trevi, 1.5 hp Hayward Matrix Powerflo, 200 SF Waterway cartridge filter

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    Re: need help with reading FC test

    Didn't make it home at lunch, but here's numbers from 7:30 p.m.:

    PH 7
    CL 5 These two from blue box kit

    FC 3
    CC 2

    TA 240 From test kit, not a test strip

    Pool calculator has me confused on what to do next. We bought some borax, but it says it will raise the TA. What do we need to do?

    Thanks,
    Frustrated Brisketbabe in Texas PS Could the 99 degree daily heat be affecting anything?
    15' round AG Trevi, 1.5 hp Hayward Matrix Powerflo, 200 SF Waterway cartridge filter

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    JasonLion's Avatar
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    Re: need help with reading FC test

    PH at 7.0 is alright, especially with TA that high. I'd leave it alone until later. That is still a little lower than I would expect PH to be, but not a problem.

    The heat means chlorine gets used up more quickly, but won't make a big difference.

    At this point it is probably most efficient to only raise FC to 15 in the evenings. Raising FC during the day will get the conversion done more quickly, but it will also require more total chlorine, since you will be losing much more of your chlorine to sunlight.
    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

  11. Back To Top    #11

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    Re: need help with reading FC test

    Welll, we're day 10 into conversion, we put our fountain in to help with the ph and TA. Added bleach last night, here's this mornings numbers:

    ph 7.6
    TA 220
    FC 12
    CC 2

    Looks like we're still using 3-4 ppm of chlorine during the night. The rest is going during the day; just checked, right now FC is 1. Since the ph has come back up, should we add the muriatic acid to try to get the TA down? Pool is clean and clear on top, but is cloudy enough we can't see the bottom. When can we get in? Seems like this is taking longer than expected.
    15' round AG Trevi, 1.5 hp Hayward Matrix Powerflo, 200 SF Waterway cartridge filter

  12. Back To Top    #12

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    Re: need help with reading FC test

    Don't worry about your TA until you are finished shocking. You still have >0.5 CC and heavy FC use overnight. Keep shocking. Once your CC is <0.5 and you aren't losing any more than 1 ppm FC overnight, then we can talk about TA.

  13. Back To Top    #13

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    Re: need help with reading FC test

    This is day 15 of the conversion. Here's today's numbers:

    ph 7.2
    CL 5-10
    TA 130
    FC 11
    CC .5

    Pool is still a little cloudy. We did add the muriatic acid the last three nights along with enough bleach to bring FC up to 15, plus our fountain is in. TA and ph have been about the same the last two days in the morning. Is the TA still the reason for the cloudiness? Is it tiime to add the CYA so we don't lose all the chlorine during the day? Temp is about 98 every day.

    Thanks
    15' round AG Trevi, 1.5 hp Hayward Matrix Powerflo, 200 SF Waterway cartridge filter

  14. Back To Top    #14
    JasonLion's Avatar
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    Re: need help with reading FC test

    Have you done an overnight FC loss test recently? What were the results of that?
    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

  15. Back To Top    #15

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    Re: need help with reading FC test

    We added bleach last night per the pool calculator to get FC to 15. This morning, FC was 11.
    15' round AG Trevi, 1.5 hp Hayward Matrix Powerflo, 200 SF Waterway cartridge filter

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