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Thread: After shock process, is this much FC loss normal in 2 days??

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    ED-209's Avatar
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    Apr 2012
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    After shock process, is this much FC loss normal in 2 days??

    Greetings fellow TFP'ers...

    I just recently, Thursday morning, completed my 1st shock process and ended with a FC of 32.5 early that morning and figured I would be good for a while so out of curiosity I just did a test about an hour ago and my FC was at 12.5, so I lost 20 PPM of FC in 2 days, is this normal?

    I think I've read some posts where higher FC levels do go down quicker but just wanted a sanity check if possible...

    It's been around the upper 80's, low 90's these past 2 days, my pool is 15,500 gallons, my CYA is 60 and water temp is 86 degrees.

    Thanks so much for the help and info.

    Wishing clear pools to everyone (my attempt at a catchy line for this forum)
    15,500 Gallons IG Vinyl Sports Pool
    300 (80 GPM) Haywood High Rate Sand Filter (S244T) | Haywood EcoStar 2" Variable Speed Pump (Sp3400VSP)
    :)Running TroubleFree Pool since 4/6/2012, thanks to Pool School, Pool Calculator, TFTeskits and the kind and helpful members here, truly can't say thanks enough :)
    I now actually ENJOY taking care of my pool and being in control and understanding and my pool is grateful as well

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    JasonLion's Avatar
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    Re: After shock process, is this much FC loss normal in 2 da

    Yep, that is normal. Assuming all else remains the same, you lose a fixed percentage of your starting FC level. Double the FC level and you lose twice as much each day.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    ED-209's Avatar
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    Apr 2012
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    Re: After shock process, is this much FC loss normal in 2 da

    Whew, thanks Jason, puts my OCD mind to rest and makes me happy too as I thought I wouldn't be able to get the FC down below shock level by this weekend. Now I get to test out the pool with the new salt level of 1870, originally 370, to see how it is and if it feels better.

    Thanks again for the help...
    15,500 Gallons IG Vinyl Sports Pool
    300 (80 GPM) Haywood High Rate Sand Filter (S244T) | Haywood EcoStar 2" Variable Speed Pump (Sp3400VSP)
    :)Running TroubleFree Pool since 4/6/2012, thanks to Pool School, Pool Calculator, TFTeskits and the kind and helpful members here, truly can't say thanks enough :)
    I now actually ENJOY taking care of my pool and being in control and understanding and my pool is grateful as well

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    Mod Squad woodyp's Avatar
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    Apr 2010
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    Re: After shock process, is this much FC loss normal in 2 da

    It is fine to swim with FC up to your shock level. You're golden.
    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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