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Thread: Dead algae settling overnight after SLAM?

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    Mirazira's Avatar
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    Dead algae settling overnight after SLAM?

    Attachment 33367Attachment 33368
    This is what I see when I get up last 3 mornings. I just vacuum it up, then there's more the next day. Water is still slowly clearing up after a month long algae debacle so I'm not really concerned just curious what is this stuff and why does it settle at night while my pump is on?
    Anyone else have this?
    Goodyear Arizona~yet to be built 25,000 gallon diving pool: Pebble interior/Pentair cartridge filter/in ground cleaning/travertine deck.

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    pwrstrk's Avatar
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    Dead algae settling overnight after SLAM?

    Looks like dead algae to me. Vacuum it up. Why it settles over night, I don't know.
    Is your FC still at shock level ? Have you passed all three criteria to stop the SLAM ?
    1. Water is crystal clear.
    2. You have CC of 0.5 or less.
    3. You passed the OCLT.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Mod Squad jblizzle's Avatar
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    Re: Dead algae settling overnight after SLAM?

    Are you running the pump 24/7 as required by the SLAM process?

    For that matter, are you following the ShockLevelAndMAINTAIN Process? Because it should not have taken over a month to still not be cleared up.

    - - - Updated - - -

    Oops, just saw that you did say the pump is on ...
    Jason, TFP Moderator
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    Mirazira's Avatar
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    Re: Dead algae settling overnight after SLAM?

    It took a month because for the first couple of weeks I didn't know what the **** I was doing, throwing in shock packets and other **** willy nilly. It didn't start to take a turn for the better until I started reading some of the info on this site, got a TFT test kit, and used nothing but liquid chlorine to kill the algae. Thank you so much!
    Goodyear Arizona~yet to be built 25,000 gallon diving pool: Pebble interior/Pentair cartridge filter/in ground cleaning/travertine deck.

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    Re: Dead algae settling overnight after SLAM?

    Won't be doing all that you know what again !!
    What is your CYA level and what shock level are you using ? 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Mod Squad jblizzle's Avatar
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    Re: Dead algae settling overnight after SLAM?

    Also how big are your pump and filter (add to your signature).
    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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    Mirazira's Avatar
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    Re: Dead algae settling overnight after SLAM?

    Jeff- my CYA was around 240 (I know!) so I had my FC @ 98! I know I was supposed to do a 75% drain/refill but that just wasn't going to happen so I had to go against everyone's advice and just slam at my crazy levels.
    Jason- idk the answer to your question, or how to find out. The equipment is labeled but I can't decipher anything in regard to the sizes. All I can say is that the filter is pretty big
    Goodyear Arizona~yet to be built 25,000 gallon diving pool: Pebble interior/Pentair cartridge filter/in ground cleaning/travertine deck.

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    pwrstrk's Avatar
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    Dead algae settling overnight after SLAM?

    Wow ! How much bleach did you have to add to get to that shock level ? I've never seen somebody SLAM at that CYA level. How much bleach have you gone thru ?
    Also a testament to FAS/DPD testing. Your shock level is good as per Pool Math also. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Dead algae settling overnight after SLAM?

    Mirazira,

    Despite your slow start, you are on top of it now and will soon have your pool clear.

    Yes, that is dead algae and you see it on the bottom overnight because those are the crevaces it can hide and gather even though the water is flowing over it. Keep following the SLAM and those piles will get smaller and smaller until they are nonexistant.

    Good work figuring everything out!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Mod Squad jblizzle's Avatar
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    Re: Dead algae settling overnight after SLAM?

    I am not sure the FAS-DPD is reliable at that high of a FC level.

    This is not a good path forward. You will never be able to test your 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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    pwrstrk's Avatar
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    Dead algae settling overnight after SLAM?

    Quote Originally Posted by jblizzle View Post
    I am not sure the FAS-DPD is reliable at that high of a FC level.

    This is not a good path forward. You will never be able to test your pH.
    I was wondering that myself but maybe it is. Good test of it I feel though. Wouldn't it bleach out if the FC level was to high ?
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Dead algae settling overnight after SLAM?

    I just looked at Pool Math and if your FC was at the min of 18 for your CYA level. it would take 33 jugs of 8.25% bleach to get to a shock level of 94. Wow !
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Mirazira's Avatar
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    Re: Dead algae settling overnight after SLAM?

    Jason, you are right the situation is not ideal. I felt I had to choose between this or just "letting it go" until we can drain in November. The thought of having an open swamp in my back yard for 2 months was unacceptable to me and in my mind dangerous.
    Honestly, I probably only used 16-20 gallons of HASA 12%. I also brushed and vacuumed religiously, it was exhausting.
    I think the chlorine was already way high from all the shock & stuff (which also contributed to the CYA, I now know) and that's why it didn't take as much as I thought it would to get it up to 98. To maintain The level I would add 2 gallons each night, for about a week.
    Not really relevant but the county inspector showed up this afternoon(we were reported for a green pool) and I was so excited to show him!!!
    Goodyear Arizona~yet to be built 25,000 gallon diving pool: Pebble interior/Pentair cartridge filter/in ground cleaning/travertine deck.

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    pwrstrk's Avatar
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    Dead algae settling overnight after SLAM?

    Good the pool was clear for the inspector !
    It seems you know what your doing now and the mistakes made just chalk up to learning experiences. I think you did a fine job given the challenge you faced with the high CYA level. Heck I learn things here everyday. The problem is retaining everything. Lol 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Dead algae settling overnight after SLAM?

    While I think the FAS/DPD test is effective, even at that ridiculously high number, I overlooked that you have not reported a pH which should have been done when your FC was 10 ppm or below..

    jblizzle and powerstruck are right.....you should let FC come down on it's own to 10 ppm, then test your pH, adjust if necessary and restart the SLAM process.

    Control your dosages this time and you will be better able to manage your pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Dead algae settling overnight after SLAM?

    Quote Originally Posted by Mirazira View Post
    I had my FC @ 98!
    This would be one to take to the pool store and have them test it just to watch their eyes pop. Then just say no when they frantically try to sell you chlorine neutralizer to bring it back down to the "recommended" 1ppm. That would be funny if I do say so myself.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

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    Re: Dead algae settling overnight after SLAM?

    Misery loves company. I also have been fighting high CYA levels (~140) with massive amounts of liquid Chlorine but I find that the FC is still at 0 every morning after putting in 1 gallon per day now but putting in over 16 gallons over the last week or two. I was using Leslie's granular chlorine generously over the last year and have now gone to their power powder and liquid Chlorine. I am in Northern California so I am trying to be a good citizen and not use too much water while we are in a draught. I will bring the CYA levels down over time with backwashing.

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    Mirazira's Avatar
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    Re: Dead algae settling overnight after SLAM?

    At least you are getting on top of it now instead of waiting until you have a thick green algae farm like I did. Surely my story has given you some encouragement, as I had (have) way higher CYA than you and it doesn't sound like you even have any visible algae (yet).
    Goodyear Arizona~yet to be built 25,000 gallon diving pool: Pebble interior/Pentair cartridge filter/in ground cleaning/travertine deck.

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