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Thread: Slamming, huge loss of FC in short time

  1. Back To Top    #1

    Join Date
    Jun 2015
    Location
    Marion, IL
    Posts
    41

    Slamming, huge loss of FC in short time

    Hey all! We recently had a lot of rain over two weeks, and i got a bit of cloudy water and i think some algae. I started a SLAM on Sunday. Cya is at 40.

    I am keeping the fc at 16 per the chart. Vinyl aboveground, sand filter. I checked it last night and somehow the fc was at 21.5. I checked in the morning and it was 20. It did have some sun exposure so i think i only lost 1 ppm last night. Cc are .5 or less, water is clear. I have scrubbed skimmer, ladder, brushed twice a day during the slam and vac to waste anything on the bottom.

    So here is my problem: I had my wife check the water 6 hours after I did, and the FC dropped to 8? Whats going on?

    Full numbers as of right now

    Fc 8
    Cc .5
    Cya 40
    Ta 110
    Ch 220
    Ph 7.6 (i think, fc is a little high for accuracy.)

    Using a tf100 test kit i got here last summer.

  2. Back To Top    #2
    cj3737's Avatar
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    Jun 2016
    Location
    North Ogden, UT
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    629

    Re: Slamming, huge loss of FC in short time

    Sun will burn off some of the chlorine and the algae will consume the rest...Maybe a slight difference in testing methods...
    Keep it at 16 until you pass oclt and the water is clear again...
    Inherited 24' Muskin Above ground
    13500 gal
    Hayward S180T92S Sand filter
    Taylor K-2006C Speedstir
    TFPC for Beginners | Pool Math | Pool School | CYA Chart | SLAM | Test Kits | ABC's

  3. Back To Top    #3

    Join Date
    Jun 2015
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    Marion, IL
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    Re: Slamming, huge loss of FC in short time

    I think my wifes methid of testing is way off. That wouod explain why jt was at 20 when i had her add chlorine to get fc to 16, but way overshot.

    It was 20 when i went to work, and 10.5 when i got home.

  4. Back To Top    #4
    cj3737's Avatar
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    Jun 2016
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    North Ogden, UT
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    629

    Re: Slamming, huge loss of FC in short time

    You've definitely got some algae.. I think normal sun burn off, even in Texas sun, is less than 4 so you've got some growers in there...Keep slamming until your FC starts to level off a bit more.

    Over shooting right now isn't a terrible thing I think when I started my slam I targeted 16 but shot up to 22 the first little bit... Itll burn off and consume the algae so no worries.. Just "try" to keep it near 16
    Inherited 24' Muskin Above ground
    13500 gal
    Hayward S180T92S Sand filter
    Taylor K-2006C Speedstir
    TFPC for Beginners | Pool Math | Pool School | CYA Chart | SLAM | Test Kits | ABC's

  5. Back To Top    #5

    Join Date
    Jun 2015
    Location
    Marion, IL
    Posts
    41

    Re: Slamming, huge loss of FC in short time

    It passed the oclt last night. I am continuing the slam til the weekend to be sure. Water is crystal clear. No cc.

  6. Back To Top    #6

    Join Date
    Jun 2015
    Location
    Marion, IL
    Posts
    41

    Re: Slamming, huge loss of FC in short time

    20160723_123120.jpglooking good!

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