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Vacuuming algae from a swimming pool.
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Previously:
https://www.homemadetools.net/forum/...295#post222080
https://www.homemadetools.net/forum/...517#post193087
https://www.homemadetools.net/forum/...268#post214892
https://www.homemadetools.net/forum/...621#post212599
https://www.homemadetools.net/forum/...560#post222884
Looks like they used some sort of alum treatment to get the sludge to settle.
I see a major backwash coming soon.
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.
Could be that they bypassed the filter and sent it directly to the sewer. I'm pretty sure that would be how I would have done it if I still had a pool.
That sure is a dirty pool.
I am voting for some alge with LOTS of dust from something; wildfire, volcano, something. It is too evenly spread around. Algee would be more concentrated in areas that always have sun, less so on the shady side of the pool.