I just bought a pond breather in hopes that it would be easier than trying to keep a hole open by running water though a pump. I bought one through Fosters and Smith, put it together and installed it in the pond. I'm just wondering if anyone else in the forum has one, because even though its plugged in, pump is running and the heater lines are warm, I don't see any water moving in the chamber. No help from F&S. Just wondering how to tell if its actually working?