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Thread: Do anything special after swimmers?

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    Join Date
    May 2013
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    Do anything special after swimmers?

    Do you do anything additional or special after swimmers, particularly regarding chlorine if levels seem ok? (This may be a dumb question but searched everywhere for answer and couldn't find it.). Tested FC this morning and was 4. Then tested about 2 hours after swimmers and it was 3, where it normally is at that time every day. Therefore, seems we hardly lost any due to swimmers. Had hubby raise to 5 but wondering if we should add more since we had swimmers. We use strictly liquid chlorine, no tabs.

    FC 3 last time checked but in process of raising to 5
    PH 7.5
    CYA 40
    TA 90/100
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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    Mod Squad woodyp's Avatar
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    Re: Do anything special after swimmers?

    You're good to go if you checked fine afterwards.
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    Richard320's Avatar
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    Re: Do anything special after swimmers?

    Pick up the wet towels....
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: Do anything special after swimmers?

    If you only lost 1 PPM I would say you are fine. Just bring it back up to the correct level and you are good to go. Usually if I am going to have swimmers I will bump it up 2-3 PPM about 30 minutes before.
    13,000 Plaster IG Pool approx
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    Re: Do anything special after swimmers?

    I would check the CC (combined chlorine) level and increase the FC, if necessary.

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    Re: Do anything special after swimmers?

    Roughly speaking, the chlorine demand from bathers in a pool will be around 1 ppm FC in 1000 gallons for every person-hour. So for your 25,000 gallon pool it would take 25 person-hours to see 1 ppm FC of chlorine demand. That's why you normally don't notice it. Of course, if someone urinates, that's different. Even so, it would take 4 cups of urine in your 25,000 gallon pool to create a chlorine demand of 1 ppm.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: Do anything special after swimmers?

    Thanks! All great info
    7+ years, inground, 25,000 gallon, vinyl, sand filter.

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