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Thread: BBB method with a semi permanant cover

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    BBB method with a semi permanant cover

    I am converting a friends pool to BBB. It is an inground vinyl, 36k gallons. He has a automatic solid cover that is on at all times except when swimming. Since he shouldn't lose much fc to sun what would the ideal cya level be. We have it at 25ppm right now and wasn't sure if we should bring it up.
    Thanks
    12,000 gal oval ag, 2.25hp 2spd pump, cartridge filter - flow rate - 100gpm, turnover 48k per 8hr

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    harleysilo's Avatar
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    Re: BBB method with a semi permanant cover

    Is his pool a saltwater pool with a SWG?
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    Re: BBB method with a semi permanant cover

    No, normal pool. Was using triclor and all the other pool store stuff.
    12,000 gal oval ag, 2.25hp 2spd pump, cartridge filter - flow rate - 100gpm, turnover 48k per 8hr

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    Re: BBB method with a semi permanant cover

    I'd think 25 is fine, but I'm concerned the CC won't get burned off without any sun. Opinions from the experts?
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    Re: BBB method with a semi permanant cover

    25ppm CYA is adequate just fine but I think RobbieH makes a good point about letting the sunshine onto the pool for a few hours each week.
    Dave S.
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    harleysilo's Avatar
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    Re: BBB method with a semi permanant cover

    Quote Originally Posted by duraleigh
    25ppm CYA is adequate just fine but I think RobbieH makes a good point about letting the sunshine onto the pool for a few hours each week.
    Wouldn't that happen with normal swim time? I thought appropriate FC levels would take care of CC regardless of sun exposure. I havent read about neccesary uv exposure time to burn off cc.
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    Re: BBB method with a semi permanant cover

    Normal swimming may well be plenty of sunlight. You only need a couple of hours a week. Chlorine alone, without any sunlight, is not always enough to get rid of all the CC. Chlorine and sunlight work together to get rid of CC. That is one of the things that makes indoor pools challenging. If CC is staying at zero there is nothing to worry about, but if CC goes up, you know you need more sunlight (and adequate FC levels).
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    harleysilo's Avatar
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    Re: BBB method with a semi permanant cover

    Good to know thanks Jason!
    18'x43' Sport Pool
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    SWCG and D.E. Filter
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    Re: BBB method with a semi permanant cover

    Another question concerning the cover. We have been shocking for 3 days and leaving the cover on, probably only getting 1 hr of sun a day. Should we be leaving the cover off for several hours a day until we pass the 3 tests?
    12,000 gal oval ag, 2.25hp 2spd pump, cartridge filter - flow rate - 100gpm, turnover 48k per 8hr

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    Re: BBB method with a semi permanant cover

    Should we be leaving the cover off for several hours a day until we pass the 3 tests?
    What are your current results? Do you have CC's?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    harleysilo's Avatar
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    Re: BBB method with a semi permanant cover

    What does the cover manufacture say about leaving pool at shock level covered? Risk of damaging the cover?
    18'x43' Sport Pool
    19,000 Gallons Vinyl Liner 3'-3.5'-4'
    SWCG and D.E. Filter
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    Re: BBB method with a semi permanant cover

    As of noon today we look like this.

    fc - 16
    cc - 0
    ph - 7.8
    cya 30-40 (added approx 1 lb last night)
    ta - 325 (going to work on this next week)

    pool was looking real good at noon. We left the cover open all morning and I am going to check things again @ 3pm. Want to see how much fc is lost when we leave the cover all the way open.
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    12,000 gal oval ag, 2.25hp 2spd pump, cartridge filter - flow rate - 100gpm, turnover 48k per 8hr

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    Re: BBB method with a semi permanant cover

    Very pretty!
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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