I've been using the Lake Clear bacteria from the C-FLO people for two summers now in my one acre pond. It has done a great job of eliminating the filamentous algae from my pond. I also installed three bottom aerators and run them 24/7 May through October.

I am now working on the heavy muck layer. I find that the muck pellets which sink to the bottom seem to work best on the high muck areas. I've tried several types.

Removing organic material is a multi-year project. What's required most is patience and a willingness to continue these expensive treatments even when progress seems kind of slow.