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Thread: Slamming

  1. Back To Top    #1

    Join Date
    May 2015
    Richmond, KY


    This is my third year with TFPC, and I no longer buy any pool chemicals! This year promises to the be very best balanced, most beautiful pool ever! I have one question about my SLAM though.
    Prior to SLAM:
    CYA (after emptying pool 75%): An amazing 55!!!!!!!!!!!!!!!!!!!!!!!!!!!!! (I will NEVER use pucks again!)
    PH 7.5
    TA 90
    FC 7
    (We SLAMMED after draining for CYA and refilling).

    SLAMMED to 23 (FC 7/CYA 55 =SLAM 23)
    Last Night FC 23
    This Morning FC 21 (Drop of 2 ppm)
    No CC's
    Water crystal clear

    My question: We had a TERRIBLE storm last night that dumped a lot of leaves, pollens, sticks in the pool. We got most of it out, but then it hit again overnight and dumped on us again. With that in mind, would an FC drop of 2 be acceptable? If not, do I need to get FC up over, say 25-26 to be sure?
    13,770 gal, AG pool-steel sides, vinyl, 24' round, Hayward Perflex Extended Cycle DE Filter, Hayward Power-Flo Matrix 1.5 HP, Type SP, TFT Test Kit-T100.

  2. Back To Top    #2

    TFP Guide
    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Greenville, SC

    Re: Slamming

    If the water is clear, holds FC overnight (OCLT) and your CC is <= 0.5 you don't need to SLAM.
    32K gallon Plaster - CircuPool SJ-55 SWG - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL/K-1766
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart - Support TFP

  3. Back To Top    #3
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Franklin, NC

    Re: Slamming

    Before I did a SLAM I would do an Overnight FC Loss Test (OCLT) to verify. Clean it out, including skimmers and bring the FC up to 10 as the sun sets toninght. Test & re-test in the morning. That difference will tell if you need to SLAM.

    If you do have to SLAM your target is 24 with 60 as your CYA.
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  4. Back To Top    #4

    Join Date
    Aug 2015
    Roseville, CA

    Re: Slamming

    I had an 8 day slam recently with 50 CYA... i had a few nights with a -2 or -3 OCLT. I just couldn't get to -1 or less, as it would go from 20 to 18 or 17. clear of course and <.5 in all cases, just above 1 OCLT....When i FINALLY used TWO heaping/good size spoonfuls of reagent instead of 1, my tests seemed to be a little more accurate. That was an additional note in the instructions that i must have missed or ignored (use more with higher PPM). Now that I am back down to 4-6, i still use one heaping.
    14,250 IG Plaster (re-do coming soon, i see concrete in a few places) I do get what appears to be "sand" in bottom of filter, about a spray paint can lid full over a month) Sta-Rite S7M120 Filter, Century SQ1102 pump. solar heat (roof tubes) figure 8 kinda shape, waterfall at deep end at bench (rarely used, but now understand i can raise ph with it), Hayward Vac Ulta, Sacramento, CA

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