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Thread: Increase in FC without adding chlorine

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    Increase in FC without adding chlorine

    I recently opened my pool and did not have to add any liquid bleach as the levels were still near slam level. I tested FC yesterday and it was 8, however, after testing it today it is at 15? My CYA is 30-40 and there is no CC. PH is 7.4 and TA is 80. What would cause this increase?
    ABG 24' Filter Cartridge 13,600 Gallons

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    AimeeH's Avatar
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    Re: Increase in FC without adding chlorine

    What test kit are you using? Do you have a SWG???
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Increase in FC without adding chlorine

    What would cause this increase?
    Testing error or someone put chlorine in the pool. No other possibilities.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Increase in FC without adding chlorine

    Test kit is k-2006. Not sure what you mean by SWG but I think you are referring to the filter.....it is not a sand filter but a cartridge filter.

    - - - Updated - - -

    I tested it twice today and results both times were 15.
    ABG 24' Filter Cartridge 13,600 Gallons

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    Mod Squad YippeeSkippy's Avatar
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    Re: Increase in FC without adding chlorine

    SWG=Salt Water Chlorine Generator
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Re: Increase in FC without adding chlorine

    Not SWG on our pool
    ABG 24' Filter Cartridge 13,600 Gallons

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    Richard320's Avatar
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    Re: Increase in FC without adding chlorine

    Is there an inline Chlorine feeder with pucks in it? Or did someone get helpful and drop a few in the skimmer?

    Chlorine's coming from somewhere. Or you're testing wrong. Any chance you're using the wrong factor to multiply drops?

    10 ml sample, 1 drop is .5
    25 ml sample, 1 drop is .2
    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!

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    Re: Increase in FC without adding chlorine

    you know what......maybe I used the 25ml mark.........multiplying 30 by .2 gives me FC of 6, which is more in line with my tests over the last few days. How many scoops of the white powder (0871 I think) should I add to my pool water to test for FC. I have been adding 2 scoops.
    ABG 24' Filter Cartridge 13,600 Gallons

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    Richard320's Avatar
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    Re: Increase in FC without adding chlorine

    Quote Originally Posted by pool$123 View Post
    you know what......maybe I used the 25ml mark.........multiplying 30 by .2 gives me FC of 6, which is more in line with my tests over the last few days. How many scoops of the white powder (0871 I think) should I add to my pool water to test for FC. I have been adding 2 scoops.
    Usually one is enough. After swirling it to dissolve it, you should see a couple undissolved crystals. If you do, it's enough. Somehow they dissolve when you add drops.
    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!

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