thank you so much. the pond sits in a low area on my property and is mostly clay. it is probably close to 100 years old and i believe it used to be spring fed. the pond has been more like a swamp for many years and this past spring i put many hours into it getting rid of the duck weed clearing the edges and aerating. it was so bad birds could walk on the surface of it. i think i lost a lot of the water from evaporation because i not only have the bottom defuser but i also had a fountain running. the fish are very healthy and the water is good. i will probable try to put a well next to it and pump as much water into it before the winter comes full force. would 8' in depth be enough? this spring i will have it dug to about 12' thanks again i really apreciate your advice.
paul