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Thread: Is this Black Algae ? See Pics

  1. #1

    Is this Black Algae ? See Pics

    My plaster is less than 1 year old. I have been keeping the FC at about a 15 level - (30 CYA) - for about 4 days now - and brushing pretty frequently.
    These are pics right after having brushed the spots with an algae brush. I have seen some of the little black heads that people talk about. And I have knocked some of them off with the brush. I think this is black algae but what I am unsure about is the almost orange-ish color of the plaster underneath the location of the black dots.

  2. #2
    Administrator JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Is this Black Algae ? See Pics

    I see what looks like two different stains, dark spots and more smudged gray areas. The dots look somewhat like black algae, but the gray looks more like metal stains.

    I suggest you try holding a vitamin C tablet against a stain/algae spot for 30 seconds, and you rub another spot/stain with a trichlor tablet for about a minute and see what effect those two treatments have.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    TFP Admin. Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. #3
    Senior Member
    Join Date
    Mar 2007
    Coastalish 'down easter'

    Re: Is this Black Algae ? See Pics

    Scrape the spot with your fingernail and rub the scraping on the back of a white business card - if the smudge is green - it's black algae and treat the pool appropriately.
    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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