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Thread: Slam question

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    Slam question

    Hi guys, I started slamming my pool today as the water was In bad shape...

    Here's my situation, my cya was at 0. I added 4 lbs of stabilizer in a sock that's currently dissolving. I added bleach and my fc is at 12 currently. I know I probably should have waited until my cya was up but the water was looking bad so I went ahead and started slamming. I've read it takes days for the cya to raise in the pool so what level of fc should I aim for through the slam process. Is it ok to continue shocking with a low cay level?
    30,000 gallon In-Ground vinyl, small fountain, Polaris 9300 robotic cleaner

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    Charlie_R's Avatar
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    Re: Slam question

    PoolMath http://www.troublefreepool.com/calc.html will help you with that, along with Chlorine CYA Chart.

    What was the water temperature when you tested your CYA? If it was less that normal room temp, chances are that you had some in there, but it didn't show up. For new additions of CYA, as soon as it is dissolved, assume it is in there, again referring to PoolMath, and dose your FC accordingly.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Re: Slam question

    4 pounds of CYA in 30,000 gallons will only raise your CYA to about 16. With it that low, I would suggest a slam level of 10 ppm.

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    Mod Squad jblizzle's Avatar
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    Re: Slam question

    I agree with James. The CYA is working in the water, just may not show up on the test. I would not add any more until you can test it again.
    Jason, TFP Moderator
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    Re: Slam question

    Ok got it, I'm currently keeping it at an fc of 10. I also have a high ph of around 8.2, should I be concerned with this throughout slamming the pool or should I deal with the ph after the slam process?
    30,000 gallon In-Ground vinyl, small fountain, Polaris 9300 robotic cleaner

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    Mod Squad jblizzle's Avatar
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    Re: Slam question

    You should have lowered the pH before starting the SLAM. That is step 1.

    If your FC gets below 10, test and adjust the pH before raising it back up.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Slam question

    Dang I should have re-read about that. I added muriatic acid the other day to lower it and thought it lowered it enough. Should I stop the slam?
    30,000 gallon In-Ground vinyl, small fountain, Polaris 9300 robotic cleaner

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    Mod Squad jblizzle's Avatar
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    Re: Slam question

    You are only slightly above 10, I would let it drop and adjust the pH.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Slam question

    Ok as long as I'm below 10 my ph reading will be accurate?
    30,000 gallon In-Ground vinyl, small fountain, Polaris 9300 robotic cleaner

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    Re: Slam question

    That is correct.
    Dave S.
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    Re: Slam question

    Will my cya test be accurate at fc 10-12?
    30,000 gallon In-Ground vinyl, small fountain, Polaris 9300 robotic cleaner

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    Mod Squad jblizzle's Avatar
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    Re: Slam question

    Only the pH test is affected by high FC.
    Jason, TFP Moderator
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    Re: Slam question

    Ok. I've ran into another problem...I didn't notice my local stores do not carry taylor r-0871 reagent for my taylor 2006...I'm in the middle of slamming the pool. The only other test I have is the taylor test kit that she's reagent 1&2 with a color matching tube. What would you guys recommend I do to test?
    30,000 gallon In-Ground vinyl, small fountain, Polaris 9300 robotic cleaner

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    Re: Slam question

    From what I understand -- granted I may be wrong -- the OTO test turns brown at around 10-12. That may be a stop-gap close enough until you get your R-0871. Order it from Dave, and he'll most likely get it shipped first thing Monday. Check with him, and see if he can do this for you.

    By the way, Cpool, Where are you located? It might be a good idea to have that info in your profile.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Mod Squad jblizzle's Avatar
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    Re: Slam question

    Another victim of the K2006 running out of FAS-DPD reagent early.

    I think the OTO is brown at higher FC than 10, might just be orange at that level.
    Jason, TFP Moderator
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    Re: Slam question

    My observation is that OTO does not turn brown until at least 30 ppm, or higher.

    If I recall correctly, I think that it is around 50 ppm.

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    Richard320's Avatar
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    Re: Slam question

    I found it! From an earlier post of mine.

    Blinding yellow is about 10. School bus yellow is about 12-13. Hunter orange is around 18, up around 25 it starts to look pumpkin orange. I never went any higher than that, but it's been reliably reported that it eventually will turn brown if you get high enough.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Charlie_R's Avatar
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    Re: Slam question

    Ok, thanks for the clarification. I'll have to bookmark this thread, as you know this will come up again!
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Re: Slam question

    Also note that some reports say that OTO won't bleach out. However, I have seen OTO bleach out at around 90 to 100 ppm. It might have been poor quality OTO. Therefore, I can't say that all OTO will bleach out, but it seems that some will.

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    Re: Slam question

    Yes i am a victim of not enough reagents...i thought i could purchase the 0871 reagent locally but apparently i was incorrect. I will take the advice on how to read the oto test kit and hopefully i can finish out this slam process. When i test it with the oto it is super yellow so i guess I'm around 10-12 which is what I'm looking for so hopefully it works. Thanks again guys, really big help.
    30,000 gallon In-Ground vinyl, small fountain, Polaris 9300 robotic cleaner

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