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Thread: whats the limit

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    whats the limit

    I am going to attempt to SC my pool with suspiciously high cya leve and i can't find any literature yet as to how much pool shock bleach to add to a pool safely at one time .. so i don't gove over that limit at one time
    21X41, 30,000, ig, vinyl,48sf de, 1hp hayward super pump, 2" piping, 2 skimmers, 1 main inlet, 2 return, built in 1988, no enclosure, lots of trees around, direct sun. Thanks in advance to all who have answered my questions.

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    Mod Squad zea3's Avatar
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    Re: whats the limit

    You need to know how high the CYA level is, and most tests only read up to 100 ppm. It is possible to have CYA at 200 or more. While it is possible to shock and clear a pool with very high CYA, the cost to do so would be high. You need to find out how high your CYA level is so you will know how much bleach to use to reach shock level, and how much bleach would be too much.

    Use a mixture of 1 cup pool water and 1 cup tap water and test the CYA level. Double the result. If your results over 70 ppm you should partially drain and refill the pool to bring the CYA level down.
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    Mod Squad Bama Rambler's Avatar
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    Re: whats the limit

    I am going to attempt to SC my pool with suspiciously high cya
    What exactly does this mean? I'm not quite understanding.
    Dave J. TFP Moderator
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    JasonLion's Avatar
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    Re: whats the limit

    It would be a lot easier for us to help you if you kept things together in one topic. There is a lot of context that is missing from this post that is central to figuring out the answer.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: whats the limit

    basiccally what im asking is how much liquid chlorine is the safe limit at one time per like .. 10000 gallons .. assuming you have a high cya level and requires alot of chlorine .. do i have to space the dosages apart a given time frame or is it sage to add the whole suggested amount at one time?

    like theres a limit to how much soda ash and baking soda you can att per volume at one time .. does liquid chlorine have a limited dosage amount as well?
    21X41, 30,000, ig, vinyl,48sf de, 1hp hayward super pump, 2" piping, 2 skimmers, 1 main inlet, 2 return, built in 1988, no enclosure, lots of trees around, direct sun. Thanks in advance to all who have answered my questions.

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    Mod Squad Bama Rambler's Avatar
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    Re: whats the limit

    Add whatever the PC suggests all at once in a steady stream.
    Dave J. TFP Moderator
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    JasonLion's Avatar
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    Re: whats the limit

    Yes, there are limits, but they are not fixed limits. It all depends on your current numbers. Saying "a high CYA level" doesn't tell us anything, we need a number or we can't answer your question.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: whats the limit

    When we had the AFR 2 weeks ago, I put about 7 gallons of 12% into my pool in under 24 hours. My FC hit about 30 PPM. I was a little concerned, but it fell quickly down to a normal level.

    Someone posted about a public pool at 50+ ppm. They said the people in the pool didn't really notice, but that it bleached some swimsuits.
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    Re: whats the limit

    I just added some cal hypo about 9 hours ago how long do i have to wait before i should add bleach since im not supposed to add two chemicals at the same time i waited .. but for how long? .. adding bleach because i've run out of cal hypo at the moment
    21X41, 30,000, ig, vinyl,48sf de, 1hp hayward super pump, 2" piping, 2 skimmers, 1 main inlet, 2 return, built in 1988, no enclosure, lots of trees around, direct sun. Thanks in advance to all who have answered my questions.

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    JasonLion's Avatar
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    Re: whats the limit

    At least fifteen minutes, preferably a little longer.
    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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