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Thread: Help with pool SLAM

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    Help with pool SLAM

    Hello all. My wife and I purchased a home over the winter with an in-ground pool. We are first time pool owners and figuring things out as we go. I have read pool school and slamming procedures. I also order the TF-100 test kit. My pool is crystal clear but I'm fairly certain I have mustard algae. It is growing on the wall and clumping on the floor in the shaded areas. My test readings are as follows:
    pH: 7.2
    FC: .5
    CC: .5
    TC: 1
    CYA: 40

    The problem is I purchased a 25 lb. bucket of sodium-dichloro-s-triazinetrione from InTheSwim before I knew I could use bleach. The pool match calculator is telling me I need 7 lbs of this product and I'm scared this will push my CYA too high. What should I do at this point? TIA!
    18'x36' outdoor In-Ground, vinyl liner
    30000 gallons
    Hayward S-244T sand filter
    Centry Centurion B128, 1.0 HP pump

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    Mod Squad tim5055's Avatar
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    Re: Help with pool SLAM

    I would hold off on using the dichlor as it will push your CYA up.
    You should read the directions on SLAMing your pool in the How To section of Pool School and follow that procedure completely to the end.



    • CC is 0.5 or lower;
    • You pass an OCLT (ie overnight FC loss test shows a loss of 1.0 ppm or less);
    • And the water is clear.

    When all three are true, you are done SLAMing and can allow the FC to drift down to normal levels.

    Don't feel you are alone. I also made a big purchase of tabs from Costco before I knew about CYA.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Divin Dave's Avatar
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    Re: Help with pool SLAM

    Hi dparker,
    Im sure at some point when you learn a bit more, you can use the dichlor.

    Tim gave some great advice and I concur with him.

    as a FYI though,
    at the bottom of Pool Math, is a Effects of Adding section. That is useful in dermining what will happen if you add x of this or that.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: Help with pool SLAM

    The dichlor is not wasted but do not use it for the SLAM. It will keep forever and, in your climate, you will get some dilution of CYA from rainwater.

    When your kit comes in, please post up your own testing and then start from there. Do not be surprised if your testing disagrees with whatever was the source for these tests you posted.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Help with pool SLAM

    These readings were taken with the Tf-100. I'm going to wait to the weekend before slamming. Thanks for the input thus far.

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    Re: Help with pool SLAM

    Hi dparker,
    I understand wanting to wait until the weekend, but the FC is so low you can develop a lot of algae very quickly. I suggest that you add enough bleach to get enough FC to prevent an algae bloom. Personally I would get the FC to 8ppm until you SLAM the pool. You will have to check the FC level as frequently as possible to maintain that level.
    Welcome to the forum and good luck.
    Gerry
    27' x 54" AG Salt Water Pool Installed 2014, Hayward 23" Sand Filter, 1 HP 2-Speed Power-Flo Matrix Pump, AQ-TROL SWG, TF-100 Test Kit

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    Patrick_B's Avatar
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    Re: Help with pool SLAM

    Quote Originally Posted by dparker View Post
    These readings were taken with the Tf-100. I'm going to wait to the weekend before slamming. Thanks for the input thus far.
    Welcome to the forum dparker.

    Whenever you get ready, let us know and we will help walk you through.

    While you are waiting, take a look into Pool School and review SLAM again while you wait. Let us know if you have any questions in the meantime.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Re: Help with pool SLAM

    Ok so I've started the SLAM process. I started with these numbers:
    FC:5
    CC:.5
    pH: 7.2
    CYA: 40
    After I added the bleach recommended to achieve shock level according to the CYA chart and pool math my numbers are as follows:
    First 30 mins:
    FC: 20
    CC:1
    I tested again within an hour and results were:
    FC: 19.5
    CC:1
    My numbers aren't moving as expected did I do something wrong? I've read pool school, ABC of pool chemistry, and slamming. I've followed the instructions laid out in these articles. Thanks
    18'x36' outdoor In-Ground, vinyl liner
    30000 gallons
    Hayward S-244T sand filter
    Centry Centurion B128, 1.0 HP pump

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    Mod Squad tim5055's Avatar
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    Re: Help with pool SLAM

    What do you mean "aren't moving as expected", what did you expect?

    For a CYA of 40 your target is 16 FC. Every time you test it should be 16 or just a little higher. Large amounts over don't speed things up. If it's not 16 add bleach to get it there.

    It should look like this
    Test
    Adjust FC
    Test
    Adjust FC
    Test
    Adjust FC
    Brush

    Test & adjust at least twice a day. More often helps. Brush at least once a day.

    Stop when:




    • CC is 0.5 or lower;
    • You pass an OCLT (ie overnight FC loss test shows a loss of 1.0 ppm or less);
    • And the water is clear.

    When all three are true, you are done SLAMing and can allow the FC to drift down to normal levels.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Help with pool SLAM

    Yeah I get that but why am I not having to adjust FC? It's holding steady I was expecting to have to add more chlorine after every test to bring the FC up. I think I calculated my pool volume wrong leading to the 20 instead of 16 shock level.

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    Mod Squad tim5055's Avatar
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    Re: Help with pool SLAM

    Quote Originally Posted by dparker View Post
    Yeah I get that but why am I not having to adjust FC? It's holding steady I was expecting to have to add more chlorine after every test to bring the FC up. I think I calculated my pool volume wrong leading to the 20 instead of 16 shock level.
    Tha t is how I narrowed down the size of my pool. Watching the effects of chemicals.

    You lost 0.5 in 30 minutes

    Just keep it above 16. When the pool is clear and you don't see any algae it's time to start watching cc & maybe and OCLT.

    With a little luck your SLAM will go fast, some do.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad jblizzle's Avatar
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    Re: Help with pool SLAM

    In your first post you state that the water is crystal clear ... so there is not much in the pool to consume the FC quickly.

    Just follow the process to hold 16ppm and brush really well where you have seen what you think is mustard algae. Then after passing the 3 criteria, boost the FC for a day as described in the Mustard Algae Article.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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