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Thread: Bleach to shock a pool?

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    Bleach to shock a pool?

    I have some black algae spores on the bottom of a pool. and I have 4 gallons of generic bleach. will 4 gal of bleach shock and kill the spores in a 12,000 gal pool?

    Thanks.
    status: gone fishing :p

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    polyvue's Avatar
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    Re: Bleach to shock a pool?

    Quote Originally Posted by IslandPool
    I have some black algae spores on the bottom of a pool. and I have 4 gallons of generic bleach. will 4 gal of bleach shock and kill the spores in a 12,000 gal pool?

    Thanks.
    Wouldn't that be great if it was that easy?

    Killing algae by all accounts takes high levels of chlorine held over a period of time, sometimes many days. You won't be in a position to be able to effectively fight algae until you acquire a bit more knowledge about the process. I find the content of this link helpful.

    Hint: If tabs have been used in this pool in the past, you'll have to know the level of cyanuric acid before you begin applying chlorine. Otherwise, you won't know how much or how little to pour in. Use too little, perhaps some of the algae is killed but it just keeps coming back. Use too much, you could damage the pool plaster and equipment.
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
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    Re: Bleach to shock a pool?

    Quote Originally Posted by polyvue
    Quote Originally Posted by IslandPool
    I have some black algae spores on the bottom of a pool. and I have 4 gallons of generic bleach. will 4 gal of bleach shock and kill the spores in a 12,000 gal pool?

    Thanks.
    Wouldn't that be great if it was that easy?

    Killing algae by all accounts takes high levels of chlorine held over a period of time, sometimes many days. You won't be in a position to be able to effectively fight algae until you acquire a bit more knowledge about the process. I find the content of this link helpful.

    Hint: If tabs have been used in this pool in the past, you'll have to know the level of cyanuric acid before you begin applying chlorine. Otherwise, you won't know how much or how little to pour in. Use too little, perhaps some of the algae is killed but it just keeps coming back. Use too much, you could damage the pool plaster and equipment.
    Thanks. ok so I have tons of chlorine and time....clients are away till January. need to test for CYA though. and will need to give it a good brush more often.
    status: gone fishing :p

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    frustratedpoolmom's Avatar
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    Re: Bleach to shock a pool?

    Yes, if it's true black algae, brushing with elevated chlorine levels is the key to killing it - its got this tough chlorine-resistant outer shell that you need to knock off so the chlorine can attack the insides the or "roots" and kill it.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Bleach to shock a pool?

    Quote Originally Posted by frustratedpoolmom
    Yes, if it's true black algae, brushing with elevated chlorine levels is the key to killing it - its got this tough chlorine-resistant outer shell that you need to knock off so the chlorine can attack the insides the or "roots" and kill it.
    ah I see ok thanks. will be brushing plenty today. unfortunately the pool is painted.

    I think I'll make it a policy not to take on any painted pools from now on.
    status: gone fishing :p

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    New2Me's Avatar
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    Re: Bleach to shock a pool?

    Since you don't have to worry about bleaching out the color, and in fact that is what you ARE trying to do, I would get a length of pipe that will reach right to the spots, and then slowly pour in the bleach (with the pump OFF.) Since the bleach is heavier then water, it will pour right down and sit on the bottom, bleaching the stains. This can be a problem with vinyl lined pools, and is why good mixing is a must.
    22 x 40 IG vinyl lined, 23,570 gal.
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    frustratedpoolmom's Avatar
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    Re: Bleach to shock a pool?

    You can try a vinyl-type pool brush instead of ss and see if that's easier on the paint?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Bleach to shock a pool?

    Quote Originally Posted by New2Me
    Since you don't have to worry about bleaching out the color, and in fact that is what you ARE trying to do, I would get a length of pipe that will reach right to the spots, and then slowly pour in the bleach (with the pump OFF.) Since the bleach is heavier then water, it will pour right down and sit on the bottom, bleaching the stains. This can be a problem with vinyl lined pools, and is why good mixing is a must.
    interesting idea. do you think my tele pole might do the trick?

    or do I have to go and buy some 8ft pvc pipe?
    status: gone fishing :p

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    Re: Bleach to shock a pool?

    Quote Originally Posted by frustratedpoolmom
    You can try a vinyl-type pool brush instead of ss and see if that's easier on the paint?
    I have one of these brushes with blue bristles..

    status: gone fishing :p

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