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Thread: Dead algae?

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    Dead algae?

    Some times when I shock for 3-4 days after I get what looks like a black dirt on the bottom of my pool that seems like dust if it were dry. It dissipates with even the slightest water movement. Do others ever have this issue? Could that actually be dead algae? My cc at one point was 6 and now it's 2.5. Not shocking everyday due to aa treatment 10 days ago. Dropped in 2 1/2 gallons of liquid chlorine And that's when it does it. Going to shock again tomorrow night. Pool clear and no staining, but with sand filter it doesn't easily hold this black "dust" for lack of a better word. In the past I always worried it was a broken line til I figured out ur was only when I schocked.
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Dead algae?

    I think I've got the same stuff in my pool. Does your's seem to lump together in spots or does it basically cover the bottom totally? I can brush like you said and it dissipates instantly and will stay suspended if the pump is NOT RUNNING, but as soon as I turn the pump on it settles to the bottom. Does your's do this?
    Intex Ultra 16x48
    Intex 2650 Sand Filter
    Installed June 2, 2012

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    Re: Dead algae?

    Yes, exactly that. Settles in divots in liner. Some bigger than others. Does urs do after shocking or find it happens at other times? Can be frustrating to vacuum and see perfect clear water until u turn filter back on. Definately settles in ruts and divots.
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Dead algae?

    Also has anyone figured out how to get rid of it faster. I do vacuum to waste periodically but think it happens for a few days because of dying algae. Just theorys here because it always disappears after several days. I'm just looking for someone to tell me what they think it is, my guess is dead algae.
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Dead algae?

    Bobswe,

    It sure sounds like dead algae and it sure sounds like you are not shocking your pool properly....you still have cc's of 2.5? Then you never finished the process. read "How to Shock Your Pool" up in Pool School, follow that article perfectly and that "drop out" of dead algae will no longer occur.

    RTR,

    I think you have the same issue. To an extent, I can only guess because there are no test results and what we do here on the forum begins and ends with test results.

    The one test result bobswe posts is a dead giveaway for the need to shock the pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Dead algae?

    Sorry guys, here are tf100 test results
    Fc .5
    Cc 2
    Ph 6.8
    Cya 40
    Ta 80
    I did read how to shock but too early too follow those instructions because of aa treatment. I have successfully lowered cc to 2. I'm going to put in some borax to raise ph but should I raise ta first? Trust me when I tell u I'd love to shock tge heck out of this pool but being patient due to aa treatment and clean liner. (other than the algae fallout?)
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Butterfly's Avatar
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    Re: Dead algae?

    First raise the pH to about 7.2. If you will use bleach/liquid chlorine, you can leave the TA at 80 and be just fine.

    If you are going to keep using those pucks, you need TA 100 to 120.

    I suggest (again) that you use bleach/liquid chlorine.
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    Re: Dead algae?

    Regardless of your AA treatment, you do not have enough chlorine in the pool to prevent algae
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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