This will be the first winter with my pond. My pond is approximately 3.5 feet deep pretty much all around. Its approx 23ftx18ft in circumference. My waterfall is pretty high and the water output through the biofalls is considerable. I have 4 large Koi and 5 small Israeli Commets. My question is can I run the biofalls all winter long? I live in northern Jersey. My pump will be way below the freezing mark and the falls will keep the water full of oxygen. What is the opinion on this? I would take in my Pondmaster pump and filter but keep the Biofalls running. Any input will be appreciated