Hey, for those of you who have quite a lot of experience with water features, what's the protocol for water features in freezing temperatures? Here in Oregon, it rarely freezes or snows, even in the winter. Typical winter temperatures, even at night, are 45-60 degrees. But lateley, we've had a few nights where temps reached down to 31 or 30 degrees. My own personal water features seemed to continue to work just fine. But we've installed a few water features for clients of ours and they are beginning to ask what, if anything, needs to be done. In the water features I've installed, they are mostly pondless waterfalls where the pump 4' underground inside a vault that is surrounded by water and large river rock. I figure the chances of things freezing that far down are fairly remote if ground temps are only 31. But should I tell them to turn it off entirely on those nights? Also, at what point should we actually remove the pump?