I've been off of the Newsgroups for a while.. Comcast stop supporting
them for some reason so if this was already addressed.. I apologize
for the redundancy:

My Filter is still running, my pond is all closed., My concern:
The PVC from the Filter back to the pond, do I need to worry about the
water freezing inside? Do I need to insulate the PVC. I have the
water flowing at full speed, (No idea what the flow rate is).
Any suggestions are welcomed