I am thinking about installing a magnaclean into my system. had BG out a few months ago and they put a magnet onto my pipework in the airing cupboard which stuck to it! i have since run a couple of flushes through the CH system and drained down several times and added inhibitor. question i have is which pipe is best to install the magnaclean on? i probably need a powerflush but thought this might help in the interim?