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Thread: Drinking Water Chlorine level

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    Drinking Water Chlorine level

    Need help with a non pool question. I have a 300 gallon water tank that I want to add bleach to to prevent algae growth. Based on the pool calculator with a CYA of 20 which I know is more than I will have in tap water I will only need to add 1.9 ounces which is only 1/4 cup of bleach to maintain a FC level of 3.

    Web states that drinking water acceptable limit is 4 ppm of chlorine. Is the FC a ppm number or different.

    The water in the tank will not be used to drink but to bathe, wash dishes, brush teeth, etc...

    Please help.
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

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    Mod Squad woodyp's Avatar
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    Re: Drinking Water Chlorine level

    It shouldn't have any CYA in it at all. If it is already good clean water...........I think 4 drops per gallon is what is recommended.........to maintain it at DRINKING water level. There are approximately 450 drops of bleach in one fluid ounce. So, a little more than 3 ounces is what I come up with. Hope that helped.
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    JasonLion's Avatar
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    Re: Drinking Water Chlorine level

    FC is measured in ppm, so the drinking water standard does convert directly to a standard FC measurement of 4.

    Keep in mind that chlorine breaks down fairly quickly, so the actual FC level will be lower after several hours, and lower still the next day and so on.
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    Re: Drinking Water Chlorine level

    The container is sealed with a screw on lid. Will the FC still lower if there us no evaporation due to the sealed container?
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

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    JasonLion's Avatar
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    Re: Drinking Water Chlorine level

    It won't go down even remotely as quickly as it would outside (in hours), but it will still go down (in weeks).
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