I have an 24' above ground pool. I put in a new liner and filled it with county water.

My pool levels are good, however, I am not sure what I have that forms in the bottom of my pool. It looks like grey clouds and when you sweep it, it just disentegrates into a cloud of smoke.

I vacuum with a pool rover and afterwards my pool looks great until 1-2 days later the stuff is back. Could this be algae or what?

Any suggestions? Thank you for any info.