Theo, yes you would definitely lose a lot of that water. I have the same problem. That's why last year I only ran the pump during periods when we had plenty of rain and the pond level was high. As soon as the water level dropped as low as I was comfortable with I shut it off until we got more rain and the level went up. I know what my normal pond levels are and I know what level is safe so that I don't lose too much before winter. I would imagine that any amount of time that you can do this you will be removing nutrients and be better off for it.


Gotta get back to fishin!