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Thread: FC slow to come down

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    Join Date
    Sep 2007
    High Point, N.C.

    FC slow to come down

    We had a lot of rain week before last and an algae bloom started late last week. My FC was like 2. My CYA was 55. I got my PH to 7.5 with acid and began to slam (by the book). It was slow getting my CYA up during the summer so I decided to slam with Trichlor initially. I got my FC up to 26 and kept it there during the slam with bleach. I swept the entire pool each day. On Sunday morning the OCLT revealed an overnight drop of 1 ppm FC to 24 and a CC of 0.5. The pool was clear except for a little cloudiness. I was done. I left the SWG off and on Wednesday checked and the FC was 19. I checked the CYA and it was up to 80. I just checked the FC this morning and it's only down to 15. What's going on here? I've never had FC stick around like this, of course I never had CYA that high...usually sub-optimal. Is something wrong or should I just wait with SWG off?


    20,000gal, inground, vinyl liner, 1.5hp Hayward Superpump, Hayward sand filter, Heat Pump, CircuPool SWG, BBB w/o Borax, one skimmer, Caretaker floor popups, two return jets at stairs, waterfall.

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: FC slow to come down

    of course I never had CYA that high.
    That's the answer. It'll still come down....give it time
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    TFP Guide

    pabeader's Avatar
    Join Date
    May 2015
    Cartersville Ga

    Re: FC slow to come down

    Not directly related to your question but...
    You said "The pool was clear except for a little cloudiness. I was done."
    Actually, you aren't done with the SLAM yet. No cloudiness, at all, is one of the three criteria for completion.
    Bob - INTEX 12x24 owner (not setup yet), 'New to me' Kreepy Krauly Sand Shark, Test kit: TF-100 w/Speed Stir

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