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Thread: How long until FC shows up?

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    Join Date
    Jun 2015
    Location
    Bergen County, NJ
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    How long until FC shows up?

    Hey all, so I'm slowly making the transition from trichlor tabs over to bleach. There was heavy rain the past couple of days and now the pool is very cloudy. Tested the water today and there was 0 FC although there were two trichlor pucks in the skimmer.

    30-35k gallons
    Plaster
    FC- 0
    pH-7.5
    TA-160
    CH- 300
    CYA- 60

    At one point when I tested about two weeks ago the CYA reading I got was around 70-80 but I think the heavy rainfall helped lower that a bit. I used poolmath and added 242 fl oz of 8.25% Clorox bleach into the pool making sure to poor slowly in front of the water jet. This was about 3 hours ago. My question is how long should it take to raise the FC from 0 (or close to 0) to around 6-7? I just tested for FC again and the reading is still at 0. Thanks!

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
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    May 2010
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    Tucson, AZ
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    Re: How long until FC shows up?

    Welcome to TFP!!!

    You should be able to retest at least 30 minutes after you added the bleach.
    If you have a CYA of 60ppm and the FC dropped back to 0 in 3 hours, then you must have something in the water consuming the FC and likely need to follow the ShockLevelAndMAINTAIN Process.

    What test kit do you have?
    Please add your pool details to your signature as described HERE as it will help us help you.
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  3. Back To Top    #3

    Join Date
    Jun 2015
    Location
    Bergen County, NJ
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    Re: How long until FC shows up?

    Quote Originally Posted by jblizzle View Post
    Welcome to TFP!!!

    You should be able to retest at least 30 minutes after you added the bleach.
    If you have a CYA of 60ppm and the FC dropped back to 0 in 3 hours, then you must have something in the water consuming the FC and likely need to follow the ShockLevelAndMAINTAIN Process.

    What test kit do you have?
    Please add your pool details to your signature as described HERE as it will help us help you.
    Thanks for the quick response. I'm using the TF 100 test kit. I tested for FC about an hour after as well and it was still reading zero. I'll look into slam. Thanks.

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: How long until FC shows up?

    Did you do the CC portion of the test?

    I would target a FC of about 10ppm and do the FC and CC tests after about 15 minutes and report back.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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