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Thread: Is this Algae?

  1. Back To Top    #1

    Join Date
    Apr 2015
    Location
    Richland WA
    Posts
    55

    Is this Algae?

    3 days ago I found some brown sediment in the bottom of the pool in the morning. Yesterday it was there and again today I found brown sediment. It's very fine and basically disappears when you attempt to touch or remove it. I wouldn't really say the amount is growing but it's definitely not getting filtered out by my sand filter and I think it is too fine to get picked up by my polaris. If I turn on my polaris pool sweep, it will be gone in approx a half hour but seems to be returning.

    My pool water was and is very clear. I just checked the chlorine test and its reading at or slightly above 3ppm. I'm going to re run my tests once I get some advice on identifying the culprit.

    I did notice what looks to be a dirty ring forming on the sides of the pool. I'm suspecting this is Algae? I can't honestly say if this ring is new or I just noticed it.

    The pool was very filthy when I opened it with terrible green water, vegetation growing in it and several pretty bad stains on the plaster from leaves and dirty water. There was a definite ring at that time but I thought it had completely faded.

    I had slammed the pool to get it into this condition prior to finding this forum. I'm concerned I may not have slam (Maintined) the levels long enough and never fully killed the algae?

    If it's helpful I can retest the water and post up new results but here's what I had a few days ago prior to noticing the sediment.

    FC greater than 5 Range only goes to 5 and it is slightly more yellow than 5. I'm guessing 6?
    PH 6.8
    TA 120
    CH 250
    CYA 40
    CH Drop 7.5
    CC 0
    TC greater than 5

    Here's a video of the sediment and a closeup of the walls.

    https://youtu.be/MeYvhmLhJIY

    What do you think?
    24,000 gal in ground, Gunite, Sand filter, Hayward 140,000 btu heat pump, Pentair Superflow VS, Polaris pool sweep, TF-100 test kit w/speed stir

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Is this Algae?

    That looks like pollen accumulating on the bottom of the pool and either calcium scaling or calcium etching on the walls. Whatever is on the walls, it isn't related to the very fine dust debris on the bottom of the pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3
    April's Avatar
    Join Date
    Apr 2014
    Location
    KY
    Posts
    138

    Re: Is this Algae?

    Had the same problem. Thought it was algae and ended up being pollen.

    I put a sock in my skimmer basket to catch it. Took about 2 days and changing the sock every couple of hours. I also brushed the pool every couple of hours to stir it up really good.
    18ft Round AG, Vinyl, 100LB Pentair Sand Filter, 1HP, June 2012, TF-100 w/SpeedStir

  4. Back To Top    #4

    Join Date
    Apr 2015
    Location
    Richland WA
    Posts
    55

    Re: Is this Algae?

    Great, Thanks! I'm glad I held off on sending my wife for an emergency run of bleach from the hardware store! I vacuumed it all up just now and my blood pressure has returned to normal.
    24,000 gal in ground, Gunite, Sand filter, Hayward 140,000 btu heat pump, Pentair Superflow VS, Polaris pool sweep, TF-100 test kit w/speed stir

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