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Thread: Algae or something else?

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    Join Date
    Aug 2011
    Location
    Girard, Ohio
    Posts
    4

    Algae or something else?

    Just bought a house with a pool and there are yellowish brown "stains" on the bottom. After 2 weeks of initially starting to take care of the pool, the water is balanced. When first tested, the chlorine level was 0. Water was clear. Added shock, algae (or whatever) disappeared. Stains reappeared after 2-3 days. Have some sort of "frog" chemical system. Water is crystal clear just these spots are a problem.

    Attached two photos of the spots. Any advice or help would be appreciated!
    Attached Images Attached Images
    1) 13,000 gallon
    2) cartridge filter
    3) above ground

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    Join Date
    May 2011
    Location
    Clearwater, FL.
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    446

    Re: Algae or something else?

    Hi consig10 and welcome to TFP!
    I don't know anything about the FROG system, but what I have heard in this forum is not to use them. I'm thinking it might be a copper based system?

    Your # 1 goal is to learn about what method of water chemistry we use here.
    Start by reading through the Pool School link at the top of the page.
    http://www.troublefreepool.com/pool-school/

    Order a FAS-DPD test kit to test pool water. (my recommendation is the TF-100 kit, hands down the best tool in my toolbox!) Get one here...
    http://tftestkits.net/splash-page.html

    Follow these instruction from here with your pool water test results...
    http://www.troublefreepool.com/what-...ns-t10341.html
    This is what I have done and now I don't have any problems with my pool now!
    It's always perfect and SCREAMING for us to come swimming every minute!

    Chuck
    Swim n Play 21' round, expandable 72" liner, 6FT deep center, buried 14", 12,750 Gallons
    Waterway 1HP-2 speed with 22" Sand filter
    TF-100 test kit
    Thanks to TFP my pool is perfect all the time :party:
    I now suffer from Sparklypoolitis! :whoot:
    I am a Platinum contributor because I want everyone who comes here to Trouble Free Pool to have the same success that I enjoy with my pool and family.

  3. Back To Top    #3

    Join Date
    Aug 2011
    Location
    Girard, Ohio
    Posts
    4

    Re: Algae or something else?

    The plan for next year is to get rid of that system and start utilizing this website...they left some chemicals...plus I live in Ohio, we have only a month of swimming weather yet before I close it down. Just wanted to try to take care of these stains before closing if I can.

    If that is a copper based system, could the stains be copper? Just wondering.
    1) 13,000 gallon
    2) cartridge filter
    3) above ground

  4. Back To Top    #4

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    duraleigh's Avatar
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    Apr 2007
    Location
    Sebring, Florida
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    Re: Algae or something else?

    Get a tri-chlor puck and hold onto the stains for a minute or two....if they lighten or disappear, they are organic and you need to up you FC level. I can't tell you by how much because we would need to know your CYA level, pH, CH, TA, and FC first. Can you post those?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Algae or something else?

    I wouldn't use a Trichlor puck if this is a vinyl pool (it says it's above-ground so I presume it's a vinyl pool). If it doesn't brush off, you can see if a crushed Vitamin C tablet put on the stain lightens up. Otherwise, shocking with chlorine might lighten it or regular chlorine levels may lighten it over time.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Algae or something else?

    I overlooked the vinyl liner....tri-chlor puck is not the right thing to do. As Richard said, see if it's a metal stain by using vitamin C. If it's not metal, then you will know it's organic.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7
    frustratedpoolmom's Avatar
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    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
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    Re: Algae or something else?

    The stains are there (and they are probably organic) because of the frog system. Exactly how I got started here and what led me to TFP in the first place. The manufacturer of the Frog recommends you maintain the FC at .5-1 without any correlation to the CYA level. As a result you end up with organic staining which fades at shock level but reappears when FC drops to "normal" levels. If you maintain the proper FC level (refer to the CYA chart) and maintain it there for a few weeks - the stains will fade and if you maintain it there permanently they won't ever return. My fains faded permanently after 2 months of the BBB method and they have never returned in 5 summers - thanks to TFP. (The pool store told me I had black algae or a fungus under the liner and my only solution was to replace the liner. The liner is still there and that was in 2007. So there ya go.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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