Odor in WASA water

The recent complaint about the bad odor in WASA supplied water is probably due to the plastic pipes that have been used to replace the old metal main supply pipes. The American Chemical Society did a study in 2007 which indicates that HDPE pipes, like those used in Dhaka, produce the highest amount of odor of all the plastics tested, but the effect decreases after a few months. Could Dhaka WASA do something like flushing the pipes to speed up the process in order to reduce customer inconvenience?
N Zaman
On e-mail