ktm, we still don't know if you have an adequate oxygen supply in the deeper waters. Proper aeration would ensure there is.
If you have a steady outflow of water, I would consider a bottom-draw siphon overflow system to remove the dead water. This would be a much less expensive, maintanence sp? free solution.
Adding a low catch fence would help eliminate tons of fresh leaves entering the pond as well while you get rid of the current muck.
Rainman,
Bottom draw siphon overflow system??? What is that and how does it work?
