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Thread: SLAM Advice

  1. Back To Top    #1

    Join Date
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    SLAM Advice

    Being a noob, I have some questions regarding if I should SLAM or not. Yesterday and I did a OCLT because I found two places of random yellow stains in spa that would not brush off but would lighten with the application of a puck, the OCLT passed with losing 1.0 ppm of FC and O CC.


    However, last night I noticed this stain at the bottom of my pool water (not the best picture) but it's yellow in nature and like the others won't brush off and the automatic vacuum cleaner won't pick it up. So another OCLT was performed, same results. FC loss of 1.0 ppm and 0 CC.

    My water is clear. So I'm wondering is this algae? Should I go forward with the SLAM process?

    Testing times for both OCLT and FC levels (were identical):

    2100: 6.5 FC/ 0 CC
    0645: 5.5 FC/ 0 CC

    My CYA is 40. Question about that too. I live in El Paso, and other threads I've read have mentioned to raise CYA levels to about 50-60 to combat the heat and sun exposure? Is that something I should do now?


    Thanks.





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  2. Back To Top    #2
    Patrick_B's Avatar
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    Re: SLAM Advice

    That almost looks like an object sitting on bottom, but its more like a stain, or growth and doesn't move?
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  3. Back To Top    #3

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    Re: SLAM Advice

    At first I thought it was an object too. But upon closer inspection, it looks like a stain. Won't move either


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  4. Back To Top    #4
    Mod Squad pooldv's Avatar
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    Re: SLAM Advice

    Answers to your questions first.
    No don't raise cya before a SLAM, the instructions for a SLAM are in the link. It recommends SLAMing with CYA at 30.
    Yes, in hot summer with full TX sun on the pool you will want your CYA at 50 to 60 to better protect the FC from the sun.

    Is the water warm enough to jump in and feel that stain? My guess is that it is an organic stain from some tree debris or something. In that case raising FC up to between 12 and 16, for CYA at 40, and brushing the spot several times per day will remove the stain.

    More here about diagnosing stains, Pool School - Pool Stains
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  5. Back To Top    #5

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    Re: SLAM Advice

    Okay. So raise the CYA after I get rid of the stain. Too easy.

    And no, the water temp is 64, a bit chilly for me to take the plunge! So to be on the safe sauce, raise the FC between 12-16 for a few days, until the stain disappears? Also, should I maintain the FC at those levels 24/7 like I would during a SLAM? Or just raise the FC and let it fall until it's time to add additional chlorine the next day?


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  6. Back To Top    #6
    Patrick_B's Avatar
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    Re: SLAM Advice

    That's what I would do if you are done with the Slam, and have passed all the reqs. Make that your new daily target for a few days, and see if it fades. Brush it too as he said, but you should see improvements in a few to seveal days if it is organic from tree fall or similar. See how that goes, and let us know.
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  7. Back To Top    #7

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    Re: SLAM Advice

    Here's an update:

    Since Saturday, I've kept my FC between 12-16 and brushed till I was blue in the face! Additionally, I've manually vacuumed and the automatic vacuum cleaner runs daily. Yet the stain still persists!!!

    I'm not sure why or what it is but I cannot get rid of it. Of note, the stain is directly underneath the water pipe which allows us to fill the pool when necessary.

    Would that have anything to do with it/ or caused it? Or should I just ignore until it's warm enough to take the plunge and personally investigate it?

    Thanks for the advice


    Plaster, 2 HP WhisperFlo Pump, DE Filter

  8. Back To Top    #8
    espejo's Avatar
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    Re: SLAM Advice

    Maybe take a PVC pipe that is long enough to reach the area while you are standing on the side of the pool. The end of the pipe should almost rest on the area. Then carefully and slowly pour in muratic acid and see if that begins to lift the stain. This works for me on tough organic stains.
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