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Thread: Black Algae on a Vinyl Liner

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    Black Algae on a Vinyl Liner

    I got my Taylor Test Kit. So excited about the little things. I still have black algae on my vinyl liner, but my numbers appear to be in line. Any suggestions?

    FC=25
    PH=7.8
    CYA=42
    TA=85
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    Mod Squad Bama Rambler's Avatar
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    Re: Black Algae on a Vinyl Liner

    It's very rare for a vinyl pool to have black algae. How did you determine it was black algae?
    Are you sure it's not metal stains?
    can you post a pic of it?
    Have you passed the OCLT?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Black Algae on a Vinyl Liner

    No, I'm going to start he OCLT tonight since I just got my test kit today. My pool guy came out last year and determined that we had black algae. I don't want to do algaecides unless necessary, so I'm hoping to shock it to death.

    http://img.photobucket.com/albums/v511/ ... r/pool.jpg
    18'x48" AG
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    Melt In The Sun's Avatar
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    Re: Black Algae on a Vinyl Liner

    That doesn't look like black algae to me, but that picture's awfully tiny!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    linen's Avatar
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    Re: Black Algae on a Vinyl Liner

    Yeah picture is hard to see. Is it the "black stuff" attached to the liner or can you get it to move?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Black Algae on a Vinyl Liner

    Sorry, I'll see if I can increase the size of it. I've tried scrubbing it to no avail. It doesn't budge at all. http://img.photobucket.com/albums/v511/ ... photo1.jpg I'm mostly concerned with the stuff near the seam/edge. The other is probably dirt. And the black stuff doesn't move. It's firmly attached. (Kind of like a blob of bubble gum!)
    18'x48" AG
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    Melt In The Sun's Avatar
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    Re: Black Algae on a Vinyl Liner

    That's better. I don't think it's black algae, but a metal stain. Have you been using any algaecides?
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: Black Algae on a Vinyl Liner

    I did try an algaecide earlier this week, but only once. This was present before that. I'm going to try to get down and get a sample tonight or tommorow. It's 58 degrees here (after a week of high 80's) and I'm not looking forward to closer inspection.
    18'x48" AG
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    Re: Black Algae on a Vinyl Liner

    It's definitely some type of algae. I was able to scrap a bit of it off the bottom in the rain. It was kind of green fuzzy, but appears black from the top looking down. Any ideas?
    18'x48" AG
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    Re: Black Algae on a Vinyl Liner

    After looking at picture, I'm pretty sure it might be mustard algae.
    18'x48" AG
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    Mod Squad Bama Rambler's Avatar
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    Re: Black Algae on a Vinyl Liner

    I don't think it's mustard algae either. Mustard algae likes the shaded side of the pool. There are about 7000 types of green algae. The good thing about all of them is that chlorine will kill them.

    Run the OCLT and then post a full set of test results and we'll have a better idea about what to do about it. scrubbing with a stiff brush will help but don't use a steel bristled brush.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Black Algae on a Vinyl Liner

    That is good to know. Our pool gets full sun! My husband cut down the last remaining tree overhanging it last summer. I will post OCLT in the morning.
    18'x48" AG
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    Mod Squad Bama Rambler's Avatar
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    Re: Black Algae on a Vinyl Liner

    Even if you pass the OCLT keep your FC at shock level and brush the tops off the stuff and allow the chlorine to kill it. You may need to do that a few times to get it all dead. Once it's dead you can let the FC come back down to the higher end of recommended.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Black Algae on a Vinyl Liner

    Definitely didn't pass oclt. Last night FC=25, this morning FC=15. So I added 3 more gallons to bring it back to the 25 level. Is this way too high??
    18'x48" AG
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    Sand Dollar Sand Filter w/ Zeobrite
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    Mod Squad Bama Rambler's Avatar
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    Re: Black Algae on a Vinyl Liner

    That's kinda high. With a CYA in the 40 - 50 range you should be shooting for an FC of between 16 & 20. AND, you need to test and add as often as you can to keep it there. You also should be brushing the algae as often as you can to keep the tops knocked off it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Black Algae on a Vinyl Liner

    Ok, I will definitely work on that. I was grateful that we got some cooler weather this week (figured it would slow algae growth and keep chlorine lasting longer) but it's too dang cold to jump in and really start scrubbing. I will do the best I can until I can get in. Next week we should be back in the high 80's again. Only in North Texas!
    18'x48" AG
    Pentair 1 1/2 HP Dynamo Pump
    Sand Dollar Sand Filter w/ Zeobrite
    Lil Shark Vacuum System
    Hard Plumbed

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