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Thread: Dead Algae? Fine

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    Dead Algae? Fine

    Thanks everyone for all your help with turning my pool back to swimable and beautiful condition. After a CYA through the roof I drained/refilled and got the chemicals balanced. I've been maintaining for 3 weeks now and all seems to be well. Overnight test and all.


    This fine dust that I can't seem to get rid of. It sits on the steps of the shallow end.

    Here are my readings from my TF-100 test:

    FC 5
    pH 7.8
    TA 110
    CH 270
    CYA 40

    So this dust is not from outside source as I don't live in a dusty area. I think it might be dead algae. It's super fine and when I brush it, it will cloud up the immediate vicinity. It's usually ends up settling in the shallow end. It's too fine to be picked up by the vacuum. I have brand new cartridges in my filter. I suspect that my plumbing is a bit weak and my circulation is not optimal...but that's an entirely other issue. It works, it may not be optimal, but skimmers get all the surface things, and cartridges are definetly filtering things...

    Anyway, how do I get rid of this stuff? Pool store and articles I've read suggest many chemicals, Pool floc, water clarifies, etc. Others say avoid these entirely.

    What should I be doing to clear this last bit of micro silt which is preventing my pool from being crystal clear? Also, what will the suggested chemicals do to my water balance?

    Thank you.
    13K Gallon below ground concrete pool.
    Uincel c-7477 cartridge filter system x4
    TF100 Test Kit

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    coffeegoddss's Avatar
    Join Date
    May 2012
    Minooka, IL

    Re: Dead Algae? Fine

    I've fought the same problem. I gave up. My water is always (knock on wood) balanced and I pass the random OCLT, so it is just some fine stuff that the filter and vacuum isn't getting. I use a skimmer sock and that helps after the water's been stirred up by swimming and I put an knee-high nylon in the hose when I vacuum to try and help catch stuff. But, other than that, I've just learned to live with it. It's not a lot and it's not clouding up the water, so I just chip away at it when I do vacuum and try to ignore it when I'm not.
    AG, 10,400 gallons, filter cartridge, 2HP pump
    Coffeegoddss...bonafide thread killer!
    POOL SCHOOL...fortheloveofgawd, read POOL SCHOOL

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Dead Algae? Fine

    I suspect that my plumbing is a bit weak and my circulation is not optimal...but that's an entirely other issue.
    Perhaps, but maybe it's a contributor. Live algae will hang out in areas of poor circulation only to be killed and then fall to the floor when they are exposed to a little more filtration.

    I'm guessing a little bit here but i would suggest you alter the eyeballs on your returns to simply change your circulation a bit....especially pointing a return at what might be a dead spot now.

    If, after a couple of days, you see no change, then I would elevate the chlorine up to about 8ppm and hold it there for a couple of days and see if that helps.

    Like you, I don't think it's dirt, either, but if it's dead algae, then we have to get some chlorine directed at the live algae that still remains in your pool.

    Did you say you passed the OCLT? How long ago?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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