OK...so I'm still working on shocking my pool but I have a few questions about the pump & Filter. When I was running the pump before I added so much bleach to shock, the small glass would turn green from the algae when I would backwash. NOW, it's just a dirty color then turns clear. Can someone explain to me what I'm looking at? Also, when I vacuum I get a ton of air in the pump skimmer area, is this normal?