There is a very fine black mist settling at the bottom of my vinyl pool.. I have over shock ( perhaps not enough) and vacuumed to wast several times but it keeps coming back ( wasted a lot of water)..I think it’s dead black algae .. I tried to run it through the D.E filter but it seams to bypass the D.E filter .. ….it’s so fine that I really have to go very very slow with the vac…which use a considerable amount of water… please help
