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Thread: SLAM and testing questions

  1. Back To Top    #1

    Join Date
    Apr 2016
    Richmond, VA

    SLAM and testing questions

    Test kit came in!! Here are the results (assuming they are accurate)

    pH - 7.5
    Cya - 0 (although pool store they other day measured 10)
    FC - 1ppm
    Cc - 1ppm
    Tc - 2ppm

    I tried looking at the cya/chlorine chart and wasn't sure how to figure out how much to add. We have a 24ft round pool, about 13500 gallons, with a power flow matrix 1hp 1 speed motor and a hayward sand filter. I was using shock but after a reading see I should switch to bleach. I also and having trouble figuring the strength percentage of the bleach. One of the bleaches I have says "yields 7.9% chlorine". Is this the right number? Based on my test results the cya/chlorine chart doesn't indicate how much chlorine (I'm not quite sure that all the numbers represent either). Any help for moving this SLAM process is helpful. Also, this is pool that hadn't been opened for a year or two prior to me owning he house. There are leaves and I will be going out to buy a leaf eater as there is too many leaves at the bottom of the pool mostly on both sides of the skimmer. I want to get this SLAM process moving bit unsure how to proceed. Also on the chlorine test it seems the longer you wait for it to turn pink the more pink it gets. Is there an amount of time I should wait for the r-0870 to work before adding the r-0871? Thanks for any and all advise in advance.

  2. Back To Top    #2
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: SLAM and testing questions

    Clean all visible debris possible from the pool. Take your CYA level to 30 for the SLAM. Maintain SLAM level FC for your CYA.

    7.9 is most likely 8.25 bleach.
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  3. Back To Top    #3

    Join Date
    Aug 2015
    Grandy, NC

    Re: SLAM and testing questions

    The bleach lists ingredients i.e. 8.25 sodium hypochlorite(or 10.0 or 12.5 depending on what kind of chlorine) , other ingred 91.75. You will base pool math on ingred percent. You will need stabilizer (also can be called conditioner) to raise CYA . Articles on this site tell you how to add stabilizer using a sock and the waer return.

    You need to use only 10ml sample for FC and CC. You will divide number of drops in half. When adding 0870, drop and swirl until no pink visible. If pink returns in a few seconds, add drops one by one until no pink returns, these you will then divide by two. For CC add five drops 0871 and swirl well. Again, use 0870 drops until water stays clear, and again divide by half.

    You will need to recheck pH and if still 7.5, need to drop to 7.2. Get CYA up to 30, then you can begin you slam.

    Hope some of this helps.
    19300 gal, AG vinyl, 1 HP Pentair Dynamo two stage pump, 5 yr old Hayward Vari-Flo sand filter, pool 14 yrs old, well water, testing with Taylor K2006

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: SLAM and testing questions

    Use Poolmath, link at top of page, to figure out how much stuff to add. There is a link to the instructions at the top of the Poolmath page.
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