How does the power flushing process work ?

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A Kamco Clearflow CF30 power flushing pump as used by A.A.MacMillan

The power flushing pump is simply connected into the heating system, either across the standard circulator pump couplings, across the tails of one radiator, or wherever most practicable.

Power flushing is a highly effective cleansing operation which works by pumping water at a much higher velocity than usual through the heating system, to loosen and mobilise harmfull corrosion deposits, and to suspend them in rapidly moving water. The process is made more effective by the addition of specialist cleaning chemicals to the system a fortnight before power flushing.

Once loosened, the unwanted debris are passed through a magnetic filtration system, which picks up iron oxide (rust) and removes it from the system. Other unwanted debris are purged from the system with clean water. At the end of the flushing process, the system contains fresh clean water and corrosion inhibitors are added. Reinstatement of the system to normal operation takes only a few minutes.

During the power flushing process, radiators are individually flushed, without removing or diconnecting them from the system, by directing the full output of the pump through each radiator separately.
 
Power flushing is not a high pressure operation, and is suitable for most domestic wet central heating systems. It is carried out with minimal disturbance and disruption to the normal operation of the system.

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