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Thread: Weird Stains on liner...algae?

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    Join Date
    May 2014
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    Virginia Beach
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    Weird Stains on liner...algae?

    Greetings all,

    My pool liner has a dozen stains which weren't there 6 months ago. I have picked at them with my finger, and can feel no difference from the non-stained areas. They are a mid green color and are grouped at three sites.

    My pool water has remained mostly crystal clear the three years I have owned it. My water checks fine. There is only occasional minor tree debris on the bottom and the vacuum is on constantly.

    No little kids with dirty feet, etc.

    Any ideas of what they are, how to clean them and prevent more?
    8-10,000 Gallon In Ground Pleasure Pond. Probably 15 (?) years old.
    Recently new Groovy Blue Vinyl liner. Newer Hayward DE filter and Aqua-Rite SWG system.
    Eight Passive Solar Heating Panels. 1HP single speed motor.
    Virginia Beach, VA.

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    Patrick_B's Avatar
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    Re: Weird Stains on liner...algae?

    So these are big or small spots? And nothing happens to them when you rub them with your finger, or brush them? When you say the water checks fine, what are your numbers looking like, and can you post the results?
    TFP Moderator
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    Join Date
    May 2014
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    Virginia Beach
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    Re: Weird Stains on liner...algae?

    Small spots, about the size of a cigarette butt. Medium green in color. Nothing happens when you rub them with a finger. I have not tried a brush.

    FAC 3
    TAC 3
    Salt 2900
    CH 150
    CYA 70
    TA 60
    PH 7.6
    Pho 200

    Thanks.

    (Sorry bout the lag. Had to leave the country for a spell)
    8-10,000 Gallon In Ground Pleasure Pond. Probably 15 (?) years old.
    Recently new Groovy Blue Vinyl liner. Newer Hayward DE filter and Aqua-Rite SWG system.
    Eight Passive Solar Heating Panels. 1HP single speed motor.
    Virginia Beach, VA.

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    Catanzaro's Avatar
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    Jul 2014
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    Monmouth County, New Jersey
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    2,187

    Re: Weird Stains on liner...algae?

    Quote Originally Posted by Jeff Lebowski View Post
    Small spots, about the size of a cigarette butt. Medium green in color. Nothing happens when you rub them with a finger. I have not tried a brush.

    FAC 3
    TAC 3
    Salt 2900
    CH 150
    CYA 70
    TA 60
    PH 7.6
    Pho 200

    Thanks.

    (Sorry bout the lag. Had to leave the country for a spell)
    Q: How you are testing and where did you obtain these results? Do you have one of the recommended test kits?
    Q: Liner pools have galvanized walls behind them. Some pool companies use foam to protect liners from rust if there is a tear. Do you know what type of construction you have?
    Q: You have a SWG & have your levels ever been off? PH?
    Q: Do you use any alternative sources (Algaecides, clarifiers, etc.)

    I would suggest you have pool water tested for metals. I doubt these are all tears in the liner. I had a cut so small that you could not see it from the surface (Just the stain it produced) above the cut. Wall with chlorine was creating this. I diligently go underwater every few days (day time and night time) to make sure there are no cuts or tears in the liner. This probably occurred during constructions where the liner became weak in that area. Patched up very easily.

    I you can get to a spot without diving in, possibly lean over in the pool with goggles just so you can see clearly underwater, try rubbing a spot with Vitamin C (not too much pressure) back and forth. This may remove the spots. It could be staining from many different things. I have small nuts from a tree that if it sits on the white steps for more than a day, a stain appears. Vitamin C quickly removes the stain.
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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