The system can also be power flushed. Special chemicals are added to the system then the radiators vibrated loosening lots of the rust. This process is then done to each of the radiators in turn until all of the floating debris has been removed.
This will remove the worst of it but if the system has been left in a poor condition for a number of years it will not clear out all the old cold spots.
Please phone us for any queries or help on anything 24 hours a day on 0208 964 6714.