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Thread: 8 Gallons of 6% to shock ???

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    Join Date
    May 2007
    Location
    Michigan
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    8 Gallons of 6% to shock ???

    I think my pool may have some algae growing and a shock treatment is in order but the bleach calculator says 8 gallons of 6% would be required. This seems like a awful lot considering my pool has a vinyl liner. Does this seem correct ?

    * Pool is 20*40 hopper pool with 8.5 foot diving end (25k Gallons??)
    * Liner with Aquapure salt system
    * Electric Cover
    * Water temp is currently 85


    Current Readings:
    FC 4
    CYA 55
    PH 7.8

    I have been running the aqua-pure at 75% for 15 hours a day and I can barely keep the FC at 4. I turned the aquapure off one evening and took a FC-DPD test and got a 5 for FC, then in the morning the test was 3.5.
    20*40 Liner 2'-8' deep, Spill Over SPA, Electric Cover, Jandy Purelink (Aquapure & PDA), Hayward SP2610x15 (1.5HP Single Speed), Hayward H300 (Millavolt)

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    JasonLion's Avatar
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    May 2007
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    Re: 8 Gallons of 6% to shock ???

    Eight gallons sounds about right given your CYA level and pool size. As long as your CYA level is about right, and you add chlorine as we recommend, there is no risk to the liner at all. Bleach should be added by pouring slowly in front of a return jet while the pump is running. That will mix it into the water very quickly.
    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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    Join Date
    May 2007
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    Michigan
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    Re: 8 Gallons of 6% to shock ???

    Can I add he Chlorine to the skimmer with the pump running instead ? I poured the bleach slowly in front of a skimmer before and I think the liner got bleached where I did it. It did happen in the shallow end and I know now to do it in the deep end.
    20*40 Liner 2'-8' deep, Spill Over SPA, Electric Cover, Jandy Purelink (Aquapure & PDA), Hayward SP2610x15 (1.5HP Single Speed), Hayward H300 (Millavolt)

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    Richard320's Avatar
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    Re: 8 Gallons of 6% to shock ???

    Yep, it can take quite a bit. Scroll down to the last post on page one of this thread
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad jblizzle's Avatar
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    Re: 8 Gallons of 6% to shock ???

    Do not pour the bleach in the skimmer.

    Pour it SLOWLY in front of a return a foot or so out. Think 2 minutes per bottle.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
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