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Thread: FC Variance - Pool Opening

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    Join Date
    May 2007
    Location
    Fayetteville, Arkansas
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    220

    FC Variance - Pool Opening

    Just a quick question ... CYA is 50, so shock level is 19.8 (30,600). I've kept it at shock level for 6 days now, testing and adding bleach as needed morning and evening this week. The tests were getting to the place where my early morning reading was just 1.0 down from the adjustment the night before, heading for the .5 drop and less than .5 CC target to indicate algae is gone. This morning's test was down 2.5 in FC and needed 2 96 oz. bottles to bring it back to shock level. It didn't rain last night - so .... I'm wondering what could have caused the variance this morning?

    Thanks
    Chris - Arkansas
    20x40 30,000 gal IG Liner, Pentair II Sand

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    28,409
    Chris,

    I'd bet money your water is sparklingly clear and you are finished shocking. Losing 1.0 overnite is no cause for alarm and could be contributed to a variety of things.

    That 2.5 loss is a puzzle and we could all guess but it may be just one of those things.

    Again, assuming your water looks really good, I think you're ready to let your FC come on down to maintenance levels. (between 4-7ppm) Your water may continue to improve and your daily FC loss may get a little better but I see no reason to continue shocking.

    PS - please tell me your water looks good or I'm gonna' have to throw out the whole post above!!
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Join Date
    May 2007
    Location
    Fayetteville, Arkansas
    Posts
    220
    Quote Originally Posted by duraleigh
    Chris,

    I'd bet money your water is sparklingly clear and you are finished shocking. Losing 1.0 overnite is no cause for alarm and could be contributed to a variety of things.

    That 2.5 loss is a puzzle and we could all guess but it may be just one of those things.

    Again, assuming your water looks really good, I think you're ready to let your FC come on down to maintenance levels. (between 4-7ppm) Your water may continue to improve and your daily FC loss may get a little better but I see no reason to continue shocking.

    PS - please tell me your water looks good or I'm gonna' have to throw out the whole post above!!
    Well, the pool is clearing up. The water is blue, but still very cloudy as it may take a while for the sand filter to work it all out. In past years I have used a floculant just to speed it up some, but that in itself is something of a pain to clean up after.
    I need to order some more 0871 as I have used a bunch (30-37 drops at a time for the .5 test).
    Patience is one of those things I'm always short on too.
    Thanks for the reply -
    Chris - Arkansas
    20x40 30,000 gal IG Liner, Pentair II Sand

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