Bill,
Sorry for the vagueness of my previous post. I read your response and yes, you did answer my question. Every pond will have characteristics unique to itself and the rate of oxygen consumption is only one. I certainly appreciate you taking the time and patience to answer my questions. Now rest up a bit because if my previous post had you grabbing for oxygen, the next one I'm working on is certainly going to lead you to the deep water........ \:D

Russ