I recently received a counterflow chiller. It has garden hose connections for the water but there is no hardware for the wort. What's the best way to move the wort through it? I assume I just run a tube from the kettle to the chiller on the one end and let gravity do it's thing, but what about the other? I'm guessing a pump is necessary? Also, does it go back into the kettle a few times before going to the fermentor, or is one pass enough? Any decent video links pertaining this would be greatly appreciated - I can't seem to find any.