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Thread: SLAM Question

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    SLAM Question

    The past week or so I have had some persistant algae growth on the floor and walls of my pool. Comes back, in the same spots interestingly enough, day after day. I brush it and it goes away but I can see it begining to form again the next day. Water is 100% crystal clear. I figure I should slam the pool to get rid of it once in for all..but...how do I know when I should go back to regular chlorine levels if: my CC is zero, my water is crystal clear and I have absolutely 0 chlorine loss over night.

    Do I just keep the chlorine levels at slam level every day until I don't see the algae any longer???

    I'm slightly confused as to how to handle this situation.

    Thanks!

    16 x 32 In-Ground vinyl, 21,000 Gallons, Hayward Cartridge Filter, Hayward Tiger Shark robotic cleaner, Taylor K-2006 Test Kit

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    BoDarville's Avatar
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    Re: SLAM Question

    The full detail on the SLAM process are found here:The SLAM Process

    Here are the Cliffs Notes:

    1. Measure the FC level
    2. Add enough chlorine to bring FC up to shock level (or a little higher)

    Repeat steps 1 and 2 as frequently as practical, but not more than once per hour, and not less than twice a day, until:
    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.
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    Re: SLAM Question

    My pool already meets all of those guidelines...but I still have slight algae growth everyday.....that's the problem...

    16 x 32 In-Ground vinyl, 21,000 Gallons, Hayward Cartridge Filter, Hayward Tiger Shark robotic cleaner, Taylor K-2006 Test Kit

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    Re: SLAM Question

    If you have visible algae, and start the SLAM process, I would be quite surprised if you saw the algae come back the next day. Are you saying you have held FC at SLAM level yet the algae comes back each day?

    Can you post some current test results for us to look at?
    Dave S.
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    Mod Squad JohnT's Avatar
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    Re: SLAM Question

    Any chance it 's just dirt or debris from the lawn, or pollen from a tree?
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    Richard320's Avatar
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    Re: SLAM Question

    Quote Originally Posted by dschribs
    The past week or so I have had some persistant algae growth on the floor and walls of my pool. Comes back, in the same spots interestingly enough, day after day. I brush it and it goes away but I can see it begining to form again the next day. Water is 100% crystal clear. I figure I should slam the pool to get rid of it once in for all..but...how do I know when I should go back to regular chlorine levels if: my CC is zero, my water is crystal clear and I have absolutely 0 chlorine loss over night.

    Do I just keep the chlorine levels at slam level every day until I don't see the algae any longer???

    I'm slightly confused as to how to handle this situation.

    Thanks!

    Sent from my Samsung Galaxy 10.1 using Tapatalk
    Yes. If there's visible algae, the water is not clear.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: SLAM Question

    Do we need to look at the possibility of that extra nasty kind of algae? And a good point by Richard.
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    Re: SLAM Question

    I haven't started SLAM yet. Today was my first day. After thinking about it a little more I'm thinking I will hold at SLAM level until I see no more visisble alage and then go one more day at SLAM level....

    Sound good?

    16 x 32 In-Ground vinyl, 21,000 Gallons, Hayward Cartridge Filter, Hayward Tiger Shark robotic cleaner, Taylor K-2006 Test Kit

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    Re: SLAM Question

    Sound good?
    Actually, not. The SLAM process has a beginning point (test results) and then a very clear, mandatory endpoint which involves the OCLT.

    from your post, I am unsure you have current test results to get started. Have you done that, yet?

    If you have, then you are good to go but the SLAM process really needs to end with the OCLT...also found in Pool School.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: SLAM Question

    Quote Originally Posted by duraleigh
    Sound good?
    Actually, not. The SLAM process has a beginning point (test results) and then a very clear, mandatory endpoint which involves the OCLT.

    from your post, I am unsure you have current test results to get started. Have you done that, yet?

    If you have, then you are good to go but the SLAM process really needs to end with the OCLT...also found in Pool School.
    As I stated in my initial post - OCLT is zero overnight.
    16 x 32 In-Ground vinyl, 21,000 Gallons, Hayward Cartridge Filter, Hayward Tiger Shark robotic cleaner, Taylor K-2006 Test Kit

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    Re: SLAM Question

    Yours is an unusual case, and after rereading the whole thread, I understand the conundrum.

    In your case, I would SLAM until the visible algae is gone, but then I would reconfirm the OCLT before letting it drift down to maintenance levels. It's very, very weird that you have visible algae, but no FC is consumed overnight.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Re: SLAM Question

    Quote Originally Posted by Smykowski
    Yours is an unusual case, and after rereading the whole thread, I understand the conundrum.

    In your case, I would SLAM until the visible algae is gone, but then I would reconfirm the OCLT before letting it drift down to maintenance levels. It's very, very weird that you have visible algae, but no FC is consumed overnight.
    That's why I'm perplexed....

    I'll do as you suggested. Of course, rain all day today so that won't help.
    16 x 32 In-Ground vinyl, 21,000 Gallons, Hayward Cartridge Filter, Hayward Tiger Shark robotic cleaner, Taylor K-2006 Test Kit

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    Re: SLAM Question

    Is your FC level appropriate for your CYA level?
    13500 Gal. Above Ground. Vinyl. Hayward E-100 Highrate Sand Filter with Hayward Power Flow LX pump. Installed 2006.

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    Re: SLAM Question

    Would you mind posting a full set of test results? Most likely everything is correct but one of us might see if something is slightly amiss.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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