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Thread: How to treat Black Algae on steps while draining?

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    How to treat Black Algae on steps while draining?

    I'm starting to see some black algae on my steps, I"m also draining about 80% of my pool to lower CH. Is there anything I can do to fight the algae while the steps are dry and the pool is draining?
    19,600 to 22,500 gallon plaster pool. (Every calculator is different)
    1 1/2 hp pump Don't know the flow rate
    48 sq. ft. DE filter
    Polaris 280
    Real POS Laars LX Low NOX 400k heater (5 years old and it's DEAD)

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    dmanb2b's Avatar
    Join Date
    Apr 2009

    Re: How to treat Black Algae on steps while draining?

    Pretty sure you can just use a nylon brush and diluted bleach to kill it off, but I'll let the more experienced folks chime in.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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    Join Date
    Mar 2007
    Coastalish 'down easter'

    Re: How to treat Black Algae on steps while draining?

    Why dilute the bleach?? Pour that stuff on full strength, scrub a little and repeat! Black algae is a nasty b*stard and you need to have a 'take no prisoners' approach to even put a dent in it.

    The straight bleach (the more concentrated, the better) poured directly on it will be quicker than bringing up the cl level in the entire pool. You're doing a great thing by draining the pool to be able to address the B/A - I realize that it's incidental to your having a CH problem, but this is working out in your favor.

    Also, a metal brush would do you better with a plaster pool - really 'knock the heads' off the clusters!
    Luv& Luk

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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