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Thread: losing fc

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    losing fc

    Any help would be great. Losing 4.5 ppm FC over past few says after losing 2.5 for first couple weeks. CYA 70. CC 0. PH 7.6. FC at 5.5 end of day til one gallon of bleach bumps to 10. Vinyl siding. 18 x 36. Approx 19500 gallons. Clear and no algae. Any suggestions or clues i could use?
    RJT17

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    pwrstrk's Avatar
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    losing fc

    It's not uncommon to lose 2-3 ppm of FC per day.
    If I'm understanding your post correctly your losing 4.5 over a few days which would be fine.
    You can check if there is organics consuming FC by doing an OCLT Test.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Mod Squad YippeeSkippy's Avatar
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    Re: losing fc

    Normal losses are aprox 2-3 per day. How sure are you of this CYA level? Did you use the pool store or strips, or your own TFPC approved test kit to get that number?
    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: losing fc

    My apologies. I am losing 4.5 ppm daily. I know my CYA can still stand to come down but i had started at 120 after buying my house. Last summer on average i lost 3.5 ppm but i know that was attributed to the CYA being through the roof. I was hoping the 2.5 a day i was losing after the CYA would be the norm but again the past few days ive been losing 4.5
    RJT17

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    Re: losing fc

    I used the TFPC kit
    RJT17

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    Re: losing fc

    I used the TFPC kit
    RJT17

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    Mod Squad jblizzle's Avatar
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    Re: losing fc

    As the CYA comes down, you will actually lose more FC to the sun.

    Sounds like there might be something lurking in your water. I suggest raising the FC level and Performing the Overnight Chlorine Loss Test.
    Jason, TFP Moderator
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    Defgufman's Avatar
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    Re: losing fc

    What has your sun and temperatures been during that time?
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

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    pwrstrk's Avatar
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    Re: losing fc

    I agree with Jason do the OCLT test to rule out if something is consuming FC. Post back your results and we can go from there.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: losing fc

    Will do. Sunlight is directly on pool from sunup til 6ish. Then it gets a break from tree line. Temperatures outside have been pushing 90 and the pool temp is at 78-80. I will do the test tonight and post back. Thanks guys
    RJT17

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    Re: losing fc

    As Jason and others have said, it can't hurt to run an OCLT just to rule out any nasty stuff, but I know that my pool consumes probably double the chlorine at 80 degrees or higher than it does at 60-70.
    14,000 Gal IG Pool/500 Gal Attached Spa
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    Re: losing fc

    Update. Did not lose any FC after overnight test. FC at 10. Same as last night. CC 0. Any other ideas or am I relegated to a gallon of bleach a day?
    RJT17

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    Mod Squad YippeeSkippy's Avatar
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    Re: losing fc

    Just a thought- are you sure of the strength of your chlorine? Some cheaper chlorine is less than the standard 8.25 % most common now. Dollar stores and the like sometimes have some as low as 3%. That's not a bargain y'know? Fresh chlorine is the strongest, old chlorine or chlorine exposed to outside elements loses potency.

    Yippee
    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.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

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    Re: losing fc

    Yes it is 8.25. I buy walmart brand only and one gallon jacks up my ppms 4.5 each time. I keep the bleach in my laundry room on my shelf to avoid evaporation from heat. Thanks for the thought. Im just going to monitor for another week and see if this is just my fate this summer
    RJT17

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