if open vent then power flush is normally what i suggest. sealed i tend to mains flush each rad at a time, unless the old boiler had corrosion issues. magnetic filter on every install bar new system which is then an added option. dont believe in magnacleanse alone, need high flow rates, reverse flow aswell as just a magnet.
yes i own a machine. i like acid chems.
yes i own a machine. i like acid chems.