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Thread: Chlorine rise overnight?

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    jccams's Avatar
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    Chlorine rise overnight?

    I wanted to do the loss test again just to make sure all was good. I checked my FC after sundown and had FC of 7 so I added 182 oz 6% which should have raised the FC to about 10.5 according to the pool calc. I checked an hour after adding and FC was at 10.5, perfect. I asked my wife to check this morning before sunrise and she gets 13, what gives. Is an hour not long enough to circulate after my addition last night? Pumps were running for an hour prior to test this morning too. She did use 10ml of water and 2 scoops of powder as I do.
    24,000 gal vinyl Lazy L, 1 hp pump, DE Filter, Pentair 250K heater, Letro Legend pressure side pool sweep

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    Lershac's Avatar
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    Re: Chlorine rise overnight?

    Probably a testing error on one of your parts. Or a visit from the chlorine fairy... if you see her send her my way.
    (DIY):16K Gal 20X30 rectangular IG Gunite, w/spa, CCP 520 filter,2 Pentair VS pumps, 400KBTU Pentair gas heater, Heat Pump for cooling, **update5.25.2013** added an intellichem with acid pump that will control existing SWG. My Build Thread Here

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    Mod Squad Bama Rambler's Avatar
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    Re: Chlorine rise overnight?

    On your pool configuration an hour may not be enough. Do you have anything adding chlorine to the pool automatically that you forgot to turn off?

    To prove whether an hour is enough, add chlorine to the pool and test in 1 hour or half hour intervals until the FC levels out or starts to drop. That'll tell you how long it takes for your pool.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Lershac's Avatar
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    Re: Chlorine rise overnight?

    Just checking... you dont have a swg do you?
    (DIY):16K Gal 20X30 rectangular IG Gunite, w/spa, CCP 520 filter,2 Pentair VS pumps, 400KBTU Pentair gas heater, Heat Pump for cooling, **update5.25.2013** added an intellichem with acid pump that will control existing SWG. My Build Thread Here

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    jccams's Avatar
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    Re: Chlorine rise overnight?

    No SWG and the inline feeder has not had a cartridge in it since I started BBB 3 weeks ago. Guess I'll have to do more investigating, the FC of 7 did seem a little low to me which is why I wanted to do the loss test. Typically I get 8-8.5 so the error might have been mine, but I'll tell the wife she must have miscounted. I also like the idea of a chlorine fairy.
    24,000 gal vinyl Lazy L, 1 hp pump, DE Filter, Pentair 250K heater, Letro Legend pressure side pool sweep

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