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Thread: Dark Green to teal SLAM process plateauing

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    Join Date
    Jun 2013

    Dark Green to teal SLAM process plateauing

    SLAM Process started 5/14 pump running 24/7. In the early days it seemed like I was well on my way but it hasn't been improving for that past few days. I was using a skimmer sock for a day or two but have since removed it as I believe it was limiting my flow rate too significantly. I've back washed a few times, and my PSI on the filter has been reading around 11. I'm just looking for some reassurance that I'm going the right route.

    You guys have been great!

    5/18 Evening test numbers and picture.
    FC: 26
    cc: less than .5
    PH: 8.0 + (higher than test kit shows)
    TA: 120
    CH: 160
    CYA: 0 (I never get a number to register with my k-2006)

    23K gallon plaster inground by Sylvan Pools
    Hayward S244T Sand Filter with 1.5HP Hayward c48l2n134b1
    Estimated 20+ year old pool

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Dark Green to teal SLAM process plateauing

    Re-read the SLAM should backwash when the psi increases by about 25% from it's clean pressure.

    Zero CYA? That causes a lot of chlorine loss. You should bring your CYA up to around 30 ppm and then keep your SLAM FC at around 12 ppm
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Dark Green to teal SLAM process plateauing

    What he said ^^

    You're losing CYA FC to the sun. You should get to about 30, which puts SLAM level at 12. Use the sock method to add it. If you pour it in the skimmer, you might lose it all when you need to backwash, or worse. If you scatter it, it could leave freckles on the floor because it's acidic. Sock method:

    As an aside, the pH test is useless above 10 FC. I'd save my reagents and only test FC & CC until the SLAM is done. The CYA will take a week or so to register on the test, and hopefully the water will be clear and you'll be testing everything again then, so don;t bother. Just assume that whatever amount you added is in there.
    Last edited by Butterfly; 05-21-2014 at 03:37 AM. Reason: fix typo
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Beens's Avatar
    Join Date
    Jul 2013
    Virginia Beach, Va

    Re: Dark Green to teal SLAM process plateauing

    Typo in Richard's post above: I'm pretty positive that first sentence should read, "You're losing FC to the sun. " (not CYA)
    Just jumping in to hopefully avoid unintentional confusion!

    Richard, thwack me if I'm wrong. lol

    18' x 48" (42" water depth) Intex Metal Frame 6,700 Gallons
    Hayward Power-Flo LX 1.0 HP pump
    Hayward Pro Series S166T Sand Filter
    Original Intex Floating Skimmer

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