Another thought!!! I already have power at the pond and have a pump for irrigation. The pump has a pressure head that kicks off whenever I turn on taps arround the propety. Is it feasible to put a T-junction in the main line and run another hose with a timer on it back into the pond. I could the timer to open a stop-cock and circulate water arround the dam in order to aerate/turnover water. The pump inlet is only about 1foot below the surface so I imagine I would have to have the return water coming back in at the bottom somewhere and perhaps orientate it to point towards the surface to maximise circulation.
