Vacuuming algae from a swimming pool - GIF

[Hoosiersmoker]

There's some "algae" but that looks like fine dust or volcanic ash. I've never seen that just from flocking except at :43 sec, that looks like what settles after a floculent treatment. I see a whole new filter changeout after that one! you could backwash and rinse for an hour and not clear the filter. That's a LOT of sediment.