So I have never had a pool last summer was our first year we opened it ran it all summer and then covered it at the end of summer. This year I removed the cover and I’ve been attempting to try and get it back up and running. I’ve shocked it several times over the last week and have been trying to vacuum however every time I start to vacuum debris just fills the water and it goes from clear to this.. any advice on what I can use to help get rid of this? ( I’m guessing it’s algae?)