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Thread: Strange- chlorine seems to be increasing overnight

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    Strange- chlorine seems to be increasing overnight

    New to me pool, built in 2005. Water is clear. A little bit of green around the water line at the skimmer opening. Previous owner was using solid chlorine tablets. I switched to liquid until I can get a SWG. Passed OCLT about a week ago.

    Current test results:
    FC 11.5
    CC 0
    pH 7.5
    TA 90
    CH 330
    CYA 80

    The strange thing... I havenít added chlorine in a few days and it hasnít been dropping. It was 10 last night and 11.5 this afternoon without adding anything. The chlorinator is empty. I removed the floater, which was also empty. I am keeping a solar cover on when weíre not in it but I would still expect some chlorine loss just from all the pollen dropping right now.

    Any ideas? My test reagents arenít that old but I was planning to buy all new when he has the annual preseason sale.
    Sue
    Current Pool: IG Concrete / 11,000 gal. / Sand filter / Solar heat / Hayward CL200 / Screened / TF Testkit
    Pool owner since 2001. Thanks TFP for helping me convert off Baquacil after six years!

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    Mod Squad Texas Splash's Avatar
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    Re: Strange- chlorine seems to be increasing overnight

    It was 10 last night and 11.5 this afternoon without adding anything.
    Well, one thing for sure, FC won't increase on its own unless there's some tablets or automated additions of chlorine. Since you don't have any of those, I suspect the odd increase is attributable to the before & after testing. Maybe the pump didn't mix the water well enough at one point, or perhaps the water sample was from a different area? Of course there could always a slight FC variation in the test itself. I'm assuming with the TF-100 you're pulling a 10ml water sample, adding the powder, then counting the drops until clear and dividing by 2? Example: 20 drops = FC of 10. If there's something else we should consider let us know.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Strange- chlorine seems to be increasing overnight

    Yep, that’s how I’m doing the test. The water samples may have been from different areas and the water might not have been circulating every time I took a sample... didn’t think of that. I will try to be more consistent.

    Doing another OCLT tonight. First quick dip in the new pool was yesterday. Vacuumed and scrubbed the waterline today. It’s looking good!
    Sue
    Current Pool: IG Concrete / 11,000 gal. / Sand filter / Solar heat / Hayward CL200 / Screened / TF Testkit
    Pool owner since 2001. Thanks TFP for helping me convert off Baquacil after six years!

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    Mod Squad woodyp's Avatar
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    Apr 2010
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    Re: Strange- chlorine seems to be increasing overnight

    As much as I hate it..I'm sure ready for a "pollen problem". Die winter......die!
    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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