| Can you return water through the TPRs? Or if you don't have them, just stick a return hose from pump back in to the water? Most people in cold climes like ours do shut waterfall off. They can cool off a pond too much. Left on its own, it takes a long time of high or low air temps to significantly affect our ponds. But with small streams of all that water exposed so thoroughly to the cold temps in a waterfall setting, your pond could get colder than if you just shut off the waterfall.
(Yeah waterfalls do look cool running during winter... but 'cool' can be applied both figuratively and literally!) |