Quote:
Originally Posted by entwisi
My idea was to have a very coarse internal 'screw thread' running the length of the pipe so that water could only ever fall 4 or 5 inches
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Try a couple of 45 bends at the top of the pipe. That should catch the dripping water and make it run down the inside wall of the pipe. Your downpipe must be absolutely vertical for that to happen. Maybe making it slightly off vertical will cure it as well.