I had a heavy duty cleaner in my system before a boiler change (Sentinel
800) and I went to a pressurised system.I have two radiators which have a restricted flow on the microbore pipes (I know it is the pipe or manifold and not the rad). I had hoped that flushing with a bit of mains pressure would have cleared any crud but after several attempts nothing has changed.
Are any of the system corrosion inhibitors better than others at softening any deposits as they circulate? I don't really want to use a cleaner again - I suspect I may have to change a pipe at some stage but was hoping that there may be a gentle alternative that may be worth a try.