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Thread: Trying to Figure Out What's Going On with FC

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    Join Date
    Apr 2015
    Location
    Pasadena, CA
    Posts
    56

    Trying to Figure Out What's Going On with FC

    Hello, can you help me figure out what's going on with my FC readings? Tested my water this past Saturday and got these readings:

    FC 13
    pH 7.5
    CC 0
    TA 100
    CYA 80
    CH 450

    The weekend before my FC was at 8 and before that it was at 4.5. I've never had a reading so high for FC. After Saturday's test, I turned off the chlorinator on the system so the salt cell supposedly hasn't generated any since 4 days ago, but I just tested it again and get the same reading. The weather here has cooled off in the last 2 weeks, is that it? My pool temp at the moment is about 65 degrees. Please help, is something abnormal going on? Thanks.
    22,000 gallon IG plaster pool, raised spa w/spillover, variable speed EcoStar pump, natural gas heater, 60 SF DE filter, SWG (all Hayward), AquaLogic automated controller, Kreepy Krawly, TF-100 Test Kit

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    Mod Squad tim5055's Avatar
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    May 2014
    Location
    Columbia, SC
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    8,494

    Re: Trying to Figure Out What's Going On with FC

    I'm going to guess you are getting a lot less sun on your pool. Remember, two things consume chlorine - organics and UV (from the sun).

    I have reduced my pump time to just 3 hours a day while turning up the % slightly on my Stenner pump and my FC is holding in range.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Join Date
    Apr 2015
    Location
    Pasadena, CA
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    56

    Re: Trying to Figure Out What's Going On with FC

    Well, atleast a lot less heat. It's still been relatively sunny, though temps have dropped about 20 degrees in the week or so. Before dropping the chlorinator to 0, it was at 50% for most of the summer. So this is normal? We've only had the house since January, so this will be our first winter with it.
    22,000 gallon IG plaster pool, raised spa w/spillover, variable speed EcoStar pump, natural gas heater, 60 SF DE filter, SWG (all Hayward), AquaLogic automated controller, Kreepy Krawly, TF-100 Test Kit

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    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    18,768

    Re: Trying to Figure Out What's Going On with FC

    Chlorine demand goes waaaaay down in the winter. And on an overcast day, I generally lose nothing. Sounds normal to me.
    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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