Periodic water system flushing can help to remove excess debris and biofilm from the shower's supply pipework and thus improve water quality and reduce the incidence of infection by micro-organisms.
Remove the shower's bottom end cap and isolate the water supplies at the low level servicing valves. Remove the cold strainer cap and basket then insert the flushing adaptor and connect the hose. Reopen the cold water supply to allow a higher velocity flow of water to fall. The water may be dirty due to the removal of biofilm. Allow the water to run clear and then isolate the cold water supply. Repeat this process to flush the hot water supply, taking care to avoid scalding.