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Thread: Adjusting residual chlorine

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    Adjusting residual chlorine

    Okay, I may be over thinking things, but I got to wondering exactly how high to adjust the chlorine levels to balance the residual chlorine. If I use pool calculator, and I want a FC level of 5 ppm, it will tell me how much bleach to add to get it to that point. However, more or less as soon as I add that much chlorine, the level is going to start dropping below 5 ppm (how fast depending upon when I add, how much sun, etc., but I hope you get my point). So over all my pool is generally at less than the FC level I want.

    So should I actually add a bit more chlorine (say to get it to a level of 6 ppm), and add chlorine as soon as it drops below 5 ppm? Seems to me that way the FC level of the water is going to stay closer to the level I really want over time. Thoughts on this?????

    Thanks,

    Kelley
    Kelleyaynn
    21,000 gallon (+ or -) in-ground plaster pool with Nautilus DE filter, 1 hp pump, and Zodiac G4 automatic vacuum.

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    Ohm_Boy's Avatar
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    Re: Adjusting residual chlorine

    Speaking generally, you should lose none at night, so your total loss should happen during the daytime. Measure the actual drop during the day. That should tell you how much you will need to compensate.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

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    JasonLion's Avatar
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    Re: Adjusting residual chlorine

    The goal when adding chlorine is to guarantee a minimum FC level that you never drop below. You need to adjust your target FC level so that whatever you are actually losing over the course of the day will still leave you at or above the minimum level.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Adjusting residual chlorine

    What you both have said makes sense. Tomorrow I will do the "daylight loss test", and figure things out from there.

    Thanks!!

    Kelley
    Kelleyaynn
    21,000 gallon (+ or -) in-ground plaster pool with Nautilus DE filter, 1 hp pump, and Zodiac G4 automatic vacuum.

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