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Thread: Chlorine Demand...it's going down down down...lol

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    Join Date
    Jul 2012
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    Central Texas
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    Chlorine Demand...it's going down down down...lol

    So not really a problem, but over the last few days, with lower temps and sunlight, my chlorine demand seems to be dropping dramatically. A week ago with 100+ temps for days on end (and a lower than optimal CYA) the salt cell was working at 55%. Of course that was still maintaining a level of FC upwards of 8-10 which was overkill for the CYA level, plus I had adjusted the CYA up to 70.

    So over the past week or so, the chlorine levels have climbed up to 22 and I've been dropping the salt cell output by percentages to drop it. CYA is approx 70, so shock level FC is 28 so there's no issue there, but no need to be that high. So dropped salt cell to 45% last night and FC dropped to 18 today and I dropped it another 10% tonight, so we'll see what FC is tomorrow. I don't want to drop it too fast and get into trouble if the days spike hot, rain, etc.

    Just interesting to me how th combination of getting CYA up and the decrease in the chlorine demand acted to raise the FC to a pretty high level.

    So I'm adjusting. ( and I'm pretty sure I know what I'm doing? lol)

    Is there anything I'm missinng? (Assuming we'll judge on pool related items and not questionable items like mental status, etc...lol)
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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    Mod Squad woodyp's Avatar
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    Apr 2010
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    East Texas
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    Re: Chlorine Demand...it's going down down down...lol

    I think 8-10 with a SWG is overkill myself on a normal every day basis.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Re: Chlorine Demand...it's going down down down...lol

    From the stated "required" levels, absolutely--I don't disagree. I can maintain that however with such very low SWG setting typically, I like the long pump run time for the water features, and it provides an abundance of "screw up" room is something happens. Factor of safety as it were. And it doesn't really cost me money.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
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    East Texas
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    Re: Chlorine Demand...it's going down down down...lol

    If you, your pool, and your wallet are happy----------I'm buttin' out!
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Join Date
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    Central Texas
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    Re: Chlorine Demand...it's going down down down...lol

    Lol. No problem. I appreciate the response., I just wanted to make sure I ain't missing anything in my analysis / response.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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    aussieta's Avatar
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    Langwarrin, Victoria, Australia
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    Re: Chlorine Demand...it's going down down down...lol

    when i make an adjustment to swg
    i leave it a few days to stabilize
    or you can end up too low
    SWG inground peanut shaped eco-bright concrete pool
    50,000 litres 13,000 gallons
    Lincoln Salt Chlorinator, 25 gram cell Sand Filter with glass media
    Taylor K2006-C test kit, Taylor K-1766 salt test, Dolphin M500 pool cleaner
    are you taking care of your pool or is the poolshop taking care of you

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