If you use black pipe at the end of your run or at the lowest part of the loop have a "T" going down with a short pipe and a ball valve to blow the line down and that should clean the accumulated debri out. Always have your branch "T's" facing up and then elbow your branch down to another ball valve, a "T" for the quick connector, a short nipple (About 12") and another ball valve, this will make a trap for any moisture or debri.
