Hi all. I have a salt water based pool which is lined (plastic or vinyl not sure). The pool has been covered for longer than usual (8-9 months) because of Covid as we haven't been able to get to the house which is Italy. A local pool company has opened it for me, but has found quite a bit of what looks like black algae on the side of the pool as shown in the pic. They are saying they haven't seen this in a pool before which is a little concerning. Has anyone seen this or reccommend a product or way to remove it ?
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