Well, after doing some more research (and actually reading through some post) I think I'm dealing with that yellow/mustard algea.

I've got an AG pool 18'x4'. I've just got the intex pump that came with it. I'm also using a SWG that I got. The vac that I'm using is the one that you hook up to a water hose and it uses a venturi idea to push things into a little filter bag.

I'm going to blast it with some bleach when I get home and start the pump running 24/7. Wish me luck!