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Thread: At what point will having too high a FC harm pool liner?

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    mitch08's Avatar
    Join Date
    Jun 2008
    Suffolk County, NY

    At what point will having too high a FC harm pool liner?

    Hey guys,

    Hope you all had a good winter. Long Island was a mess. Opened the pool to a lovely green swamp.

    I know I commited a sin, but I didnt check my CYA before shocking. I just brought my FC level up much higher than it probably should have been and backwashed 3 times a day

    My question is (Assuming a low CYA since I have no idea what it really is) is there a point where a FC level in the mid to high 20s can damage the liner of a pool.

    I kept my FC at or around 26 while shocking. It took 4 days, a lot of scrubbing, and a lot of backwashing but finally the pool is crystal clear. Was that dangerous to the liner? Im not swimming in it.
    18x38 Inground Liner (25k gal) Paver surround, multi-speed pump, DE Filter, Raised spill over spa, TF-100

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: At what point will having too high a FC harm pool liner?

    Well, it's completely after the fact, but if your CYA was zero, that's pretty high and much more FC than I would be comfortable with for that long.

    Bleaching of the liner probably occurs before any physical damage so, if you can't detect any color loss, you are probably fine.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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