dmax36: I did what you said, and I still ended up with water collecting in the bottom (apparently) of that canister. Obviously I did not blow the whole system completely out. I'm just hoping nothing else got damaged that I don't know about yet. I'm camping now, but not using water since I had no easy/quick way to bypass that canister and test it.
fonzie: That's a great idea and thanks for posting the link for me