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Thread: Should SLAM now?

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    Join Date
    Oct 2015
    Location
    Orinda, California
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    Should SLAM now?

    Last summer we were fighting green algae all summer long, mainly by brushing the pool. CYA was at 125, tested by pool store. End of summer we located forum and purchased tf-100 test kit. Have lowered CYA to 70 and hope to lower to 50 by the end of rainy season (April 1) My question is should we perform slam before the algae returns in the summer? I'm not sure the algae will return, might just be dormant as it is not warm. Water temp. probably around 50 degrees now. I'm no longer using the 3" pucks and am using 8.25% chlorine bleach. Water has always been clear and the FC is kept around 10. Just not sure if the algae will return. Does keeping the FC at appropriate levels prevent algae? Or do we have to kill the algae via shocking the pool (SLAM)
    Hope I am making sense to the forum and any answers will be appreciated. Thanks. TJ
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

  2. Back To Top    #2
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Location
    Columbia, SC
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    8,491

    Re: Should SLAM now?

    If you have algae hiding, it will return.

    How about a full set of test results and what is your water temperature?
    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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    Join Date
    Oct 2015
    Location
    Orinda, California
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    Re: Should SLAM now?

    these test results were performed on Sunday. Not sure of exact water temperature, guessing around 45 to 50 degrees. Test results were as follows.
    FC 10
    CC 0
    TC 10
    PH 7.5
    TA 90
    CH 325
    CYA 70
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

  4. Back To Top    #4

    Join Date
    Aug 2014
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    Northern IL
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    Re: Should SLAM now?

    How clear is the water?

  5. Back To Top    #5

    Join Date
    Oct 2015
    Location
    Orinda, California
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    Re: Should SLAM now?

    very clear, has always looked good.
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

  6. Back To Top    #6

    Join Date
    Aug 2014
    Location
    Northern IL
    Posts
    4,615

    Re: Should SLAM now?

    I would leave it for now then. There's no indictation of a problem with your numbers or clarity.

    However, if you start seeing issues as the water warms, check behind your lights, ladders, and any other low circulation areas for hidden algae.

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