I have a correction to make to my original post. I have a 300# filter. I can't clear the floating dead algae. I put FLOC in last night and I'm going to use the pump's down time to take the filter apart today. While the FLOC (hopefully) does some of the work, I'll see what's going on inside the filter. I haven't opened the filter since I installed it 5 years ago. I'll report back to the forum with my findings as (good or bad) news.

Regards,
MS