I redirect the flow right back into the pond into the in pond veggie filter. But I
too may switch to a smaller pump into the filter. I am going to dig out a timer and
shut it down at night now that temps are dropping. Time to dig out my pond heater
too. Ingrid

On Sun, 28 Sep 2008 17:56:56 EDT, "JB" wrote:

I spent some time earlier today trimming back spent lily pads and getting
things cleaned up for fall. I have a 3,000 gph pump that I leave running all
winter through my biofalls filter. Live in central Arkansas where the
winters can get cold but the pond rarely freezes all the way over. I was
thinking about switching to a lower flow water pump for the winter season to
save a little money and avoid super chilling the water on those coldest
days. The main purpose for me running water through the winter would be to
keep the bacteria alive in the filter and prevent the filter basin from
freezing solid and cracking, right? Does anyone do this? Got any suggestions
for me?

TIA

JB