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Thread: Persistent Algea with successful SLAM?

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    Join Date
    Jul 2014
    Charlotte, nc

    Persistent Algea with successful SLAM?

    Hi All--in the process of a second SLAM this year after a week vacation w/ chlorinator on with tabs.

    Except for the residual green algae dust upon brushing, the SLAM appears successful. Last 72 hours of readings below with 2 overnight OCLT < 1 and CC consistently at 0.5 or 0

    FC 15, 14.5, 16, 15, 15, 14.5, 16
    CC 0, 0, 0.5, 0, 0, 0, 0
    TA 80, 80, 80, 80, 80, 80, 80
    PH 7.5, 7.5, 7.4, 7.2, 7.3, 7.4, 7.4
    CH 100, 100, 100, 100, 100, 100, 100
    CYA 35, 35, 35, 35, 35, 35, 35,

    The pool is Chrystal clear (except when brushing and small green patches in the corners and sides); shock FC is holding; CC low to zero; clean cartridges daily. Any one have any thoughts as to why the green dust is remaining?
    22,000 vinyl IG 18x36
    Hayward Star Clear II cartridge filter; 100 sq ft
    Pentair 320 chlorinator 3" Tabs
    Pentair 1 HP motor

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    Azgirl71's Avatar
    Join Date
    Apr 2015
    Sierra Vista, Az

    Re: Persistent Algea with successful SLAM?

    Have you tried vacuming it up! It is to heavy to stay suspended in the water to filter it out, so vacuuming will be the only way to really get it out.
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    TFP Guide
    PAGirl's Avatar
    Join Date
    Jun 2012
    Central PA

    Re: Persistent Algea with successful SLAM?

    One of the three criteria to stopping a SLAM is no visible algae.

    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.

    Did you scrub in the lights, etc? You probably should continue to SLAM until it's gone, brushing everywhere you can.
    26' X 52" Intex Ultra Frame. Intex Sand Filter
    26' X 52 Intex Ultra Frame Install
    You can lead a horse to (clear) water, but you can't force him to swim in it!

  4. Back To Top    #4
    Mod Squad Patrick_B's Avatar
    Join Date
    Jun 2011

    Re: Persistent Algea with successful SLAM?

    Yes, I'm afraid there is no such animal. No successful SLAM has Algae left over afterward. As above, that's a primary criteria for passing. No Algae.
    TFP Moderator
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  5. Back To Top    #5
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Persistent Algea with successful SLAM?

    Just FYI, the PH test is not valid when FC is above 10 so no need to test.
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  6. Back To Top    #6
    DaninFLA's Avatar
    Join Date
    Apr 2015
    Sarasota, FL

    Re: Persistent Algea with successful SLAM?

    is it pollen? lots of posts here lately I see where people think they have algae and its just pollen settling. are you passing a OCLT? if you are and the green is visible, its not algae and its most likely pollen.
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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