I use BBB method. It's my first spring with a pool - new pool May of last year. I'm in GA so I opted to keep my pool "open" all winter - just used a leaf net. Pool sits at the edge of woods. Everything looked good until we had a record pollen drop this spring. Now it's green. I've filtered & vac'd. My water is balanced. Nothing seems to be using up my chlorine and CC = 0.5. Raising CL to shock doesn't seem to be affecting the green color - why I'm doubting it's green algae. Has anyone ever had their pool turn "green" (yellow pollen + blue liner = green) from pollen? Is their anything else I can do to clean it up? Do you think I'm kidding myself and it's really algae? If pollen, could the particles be too small for the sand filter to catch them? Thanks!