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Thread: FC won't go above 1 - test results posted

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  1. #1
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    Default FC won't go above 1 - test results posted

    The BBB method was going beautifully for me until 2-3 days ago. We had massive amounts of rain Friday, more Saturday, and all day Sunday as well. I tested the pool water Sunday and my results were:

    FC - 1
    CC - 0
    Ph - 7.7
    Alk - 130
    CYA - 50

    I increased the cholorine Sunday night and tested again last night with pretty much the same results:
    FC - 1
    CC - 0
    Ph - 7.6 - 7.7 (hard to tell)
    Alk - 130
    CYA - 50

    My water is still crystal clear, but like I said there was a lot of rain, so now I am worried there is algae trying to start. Do ya'll typically do some kind of preventivate cholorine when you know a big rain is coming?
    So my plan is to add enough regular household bleach to shock the pool (18x32 inground pool, about 20,000 gallons). Since all other levels are fine except FC, should this be the only thing I have to do? Also, is this called Chlorine Lock?

    Thanks a bunch for any advice!!
    Last edited by rdbrya1; 05-13-2014 at 09:28 AM.
    16x32 in-ground rectangle | chlorine pool | vinyl liner | k-2006 test kit

  2. #2
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    Default Re: FC won't go above 1 - test results posted

    There is no such thing as 'chlorine lock.'

    As far as people having algae issues after rain, it is typically because they don't go out and check their pool during the rain and thus their chlorine level gets too low.

    Take a look at the Best Guess Chlorine Chart in my signature below if you haven't already done so. With a CYA of 50, you never want your chlorine to drop below 3. So, even if it is raining, get out there and keep the chlorine levels up!

  3. #3
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    Default Re: FC won't go above 1 - test results posted

    Thanks watermom! I knew I did not want cholorine to drop below a 3. It had been consistently around 5-6 with no problems until recently. I will admit I did not go out during the rain to test to water :-( I thought that testing it before and after the rain would be okay but now I know! I'm going to get some bleach at lunch today and hope that will get it back up and keep it up. Do I need to bring it to shock levels first and then let the FC slowly drop back down? Or do I just need to add enough bleach to reach a 3-5 FC level? Thank you!!
    16x32 in-ground rectangle | chlorine pool | vinyl liner | k-2006 test kit

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    Default Re: FC won't go above 1 - test results posted

    If it were my pool, I'd probably go ahead and shock it since it dropped so low for a couple of days just in case there could be something brewing in there.

  5. #5
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    Default Re: FC won't go above 1 - test results posted

    Great, I'm headed out now to get 7 gallons...I calculated 6.5 96 oz jugs to increase FC to 15 for shock level for my pool. Is it safe or best practice to add all 6.5 bottles of bleach at once or do i need to do this slowly over the next few days?
    One last question, does the pump need to stay running 24/7 for the the next few days while I am doing this or is the typical 8 hour (10am-6pm) that I am currently doing fine?
    16x32 in-ground rectangle | chlorine pool | vinyl liner | k-2006 test kit

  6. #6
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    Default Re: FC won't go above 1 - test results posted

    After scouring the forums I hope I answered my own questions but I would love your confirmation to make sure before I mess anything up

    1. Yes, it is ok for me to all all 850oz of 6% bleach at one time instead of slowly throughout the day
    2. Leave the pump running during the day for my normal 8 hours so it can circulate the bleach
    3. Turn the pump off at night and leave off overnight to see if levels did not drop more than 1 ppm overnight

    Does that sound like a solid plan? :-)
    16x32 in-ground rectangle | chlorine pool | vinyl liner | k-2006 test kit

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