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Thread: Algae on stacked stone? (+ other chemistry questions)

  1. Back To Top    #1

    Join Date
    May 2010
    Gilbert, AZ

    Algae on stacked stone? (+ other chemistry questions)

    Hello all,

    I have a stacked stone fountain on my pool, and the stone extends into the water. It did't take long for small patches of algae to show up, but I never gave much thought to them, just scrubbed them with a brush every week, and maintained good chemistry. The algae hasn't "invaded" the pool and more or less keeps to just the stacked stone. (My theory is that the rough edge gives it something to cling to?)

    Recently, the patches have become larger and small dots of algae have appeared at the corners of the pool on the grout line. The water is still crystal clear, so I was wondering if there's a good way to get rid of them, or if I should be overly concerned? I continue to try to maintain proper pH and chlorine balance, so perhaps this is why the algae hasn't gotten out of control, but may be on the verge of doing so?

    Here are the results of my latest test:
    I have a SWG pool that was filled in Oct2010.

    FC: 2.5
    CC: .5
    TC: 3
    pH: 7.5
    T/A: 70
    CH: 530 (not sure if my test kit is getting old, as mentioned in another post I read about CH measures being off after a few years)
    CYA: <20 (going to get some acid today to bring this back up).
    Temp: 78

    Any help on what may or may not need to be modified would be greatly appreciated.

    Attached Images Attached Images
    Gilbert, AZ
    12,500 gal, 16'x26', 90' perim
    IG; Granite Blue Pebble Sheen
    SWG, Pentair VS3050 pump
    Sta-Rite cartridge filter
    MagnaSweep in ground

  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Algae on stacked stone? (+ other chemistry questions)

    Get your CYA up to 60-70ppm and increase your FC to 3-5ppm and KEEP IT THERE.

    YOu may not have to adjust SWG much because the higher CYA will protest your FC much better.

    The nooks and crannies provide an excellent hiding place for the algae to grow because you get no circulation there.

    I would suggest getting into the pool with full strength Clorox and using a turkey baster (or something similar), shoot the chlorine directly on the algae. That blast may be all you need to get rid of it......for a while.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Join Date
    May 2010
    Western Pennsylvania

    Re: Algae on stacked stone? (+ other chemistry questions)

    I was going to suggest one of those garden pressure sprayers, that you have a pump handle on top, put Clorox in that and spray the whole wall down.
    15ft round above ground pool (6600 gallons)
    Sand filter
    Jandy gas heater
    Intermatic timer

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