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Strange dark patches on vinyl liner? : r/pools
How To Easily Test For Swimming Pool Black Algae - YouTube
Help - Black stains on my vinyl liner - not coming off! Fear it's Black Algae | Trouble Free Pool
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Can you get black algae in a vinyl pool? : r/pools
How to Get Rid Of Stains On Vinyl Pool Liners | Doheny's - Pool Supplies Superstore
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Black algae? : r/pools
