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Thread: Help with overnight fc numbers

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    Join Date
    May 2016
    Location
    St. Elmo IL
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    3

    Help with overnight fc numbers

    First slam last night. Even though I used the calculator, I got the fc much higher than I needed to slam. The fc at night was 30+. This morning, fc was still higher than I need in the slam, but my overnight fc loss was greater than 1.0. As I understand this forum, that means that I am not done slamming. Should I cover the pool with the solar cover to keep the chlorine high through the day today? And then re-slam tonight? I don't know why my initial fc got so high. I used calcium hypochlorite but will have to use liquid bleach tonight. WAter still is very clear, but not the crystAl clear you get when everything is going great. We had replaced over half the water this year due to high cya. Any help is always appreciated
    kfarmit
    30' round AG, 21,200 gallons, vinyl, installed May 2011
    Hayward S210T93 sand filter, Hayward Power-Flo Matrix pump
    used TF100 fince 2015

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    Join Date
    May 2016
    Location
    St. Elmo IL
    Posts
    3

    First slam. Now what?

    Sorry if this is a double post. I'm hoping for a quick answer before I head to work. Using tfp method, my first slam needed a chlorine level of 20. Somehow, I managed to get it over 30 using calc-hypo. My fc this morning was down to 25, so by the standards, I still need to slam. Should I put the solar cover on to keep the fc high today until I return from work? Since the fc is still higher than what I need in a slam, if I can keep the fc high today, do I just do an overnight read tomorrow? If it matters, we just replaced over half the water due to high cya that is now down to acceptable 50. For any additional chlorine additions, I will be using liquid bleach.
    kfarmit
    30' round AG, 21,200 gallons, vinyl, installed May 2011
    Hayward S210T93 sand filter, Hayward Power-Flo Matrix pump
    used TF100 fince 2015

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    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Location
    Greenville, SC
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    1,798

    Re: First slam. Now what?

    Solar cover on/off doesn't matter that much. You can do an OCLT anytime, probably won't do much good until the water is crystal clear.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  4. Back To Top    #4
    Texas Splash's Avatar
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    Jun 2014
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    South-Central Texas, Marion/San Antonio
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    Re: Help with overnight fc numbers

    I would recommend a few things to help you along... work on trying to meet but not exceed your SLAM FC level based on your current CYA. When you over-shoot your SLAM FC level, you can lose more FC than what is allowed no matter what. Also, I hope you adjusted pH to 7.2 before starting your SLAM as noted on the SLAM page (link below). Definitely save the OCLT for last. If your water is cloudy and you've been losing more FC than normal each day, then let the SLAM work for as long as it needs to. Once the water is clear, then do the OCLT last. Remember that SLAMs are not overnight processes and often times they take several days. The green pools take much longer. Later you are welcome to post a full set of test numbers if you would like a 2nd opinion. Other than that, stick close to that SLAM page and follow all the notes. You'll do fine.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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