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Thread: How much bleach can I add?

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    Jerry's Avatar
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    Aug 2009
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    How much bleach can I add?

    It's been in the mid 90's here for a while now and my water is 86 degrees.

    The water is crystal clear and we swim just about every day...
    The tiny black algea spots are covering the pool's bottom and some of the side walls (surface is rough and needs replastering)...I've kept the chlorine level in the 5.0 color on the simple yellow/red test kit for several days but no effect.

    How many 182 oz. jugs of WalMart bleach could I safely add without damaging any other equipment? I've tried 2 but the spots don't react.
    It's 10,000 gallons inground.

    Brushing with a steel bristle brush as little effect - only under water power washing removes them but it would take many hours of this to remove them all.
    10,000 Gal. Inground Plaster Lap Pool
    Sand Filter
    New Orleans, LA

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    Richard320's Avatar
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    Re: How much bleach can I add?

    Shock level is dependent on the CYA level.

    Get that number and the answer is easy.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad woodyp's Avatar
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    Re: How much bleach can I add?

    Sanitization level and "Killing' level are two different things. See shocking in pool school. Gotta know the CYA level.
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    Jerry's Avatar
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    Aug 2009
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    Re: How much bleach can I add?

    I had a hunch I would not get a simple answer....

    I ran out of the CYA test solution....I'll try to take a sample in to Clearwater Pool$$$$.
    The oil drilling moratorium has us working 7 days a week trying to make ends met....
    10,000 Gal. Inground Plaster Lap Pool
    Sand Filter
    New Orleans, LA

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