HI, I know that there are endless posts on dealing with green algae, so I apologize if my question is a repeat. My water is testing correct in both chlorine and pH; I've shocked it and brushed the algae off sides and bottom. Then I started to vacuum, but the green ick is blowing back into the pool by way of the return. I have a new filter in but it's just not filtering out the algae. I read somewhere that I could put a sock or stocking? over the return to help filter the algae out but I can't find where I read it and don't want to break anything. Can someone please advise? Thank you so much in advance.