Another thing about this algae is that it will not come out. I scrub with a stainless steel wire toothbrush. We removed a large one covered with it and replaced it, which is now covered in algae anyways.
My friend had it in a tub in the dark for a month and the algae actually grew. He took a large wire brush to it and removed nothing.
ALGAE FROM HELL
This past year must be making up for the 35 good years I had before..
