Product review (5 stars): Whirlpool Reservoir Replacement
Because of a 1-yr lack of bacterially innocuous water, the icemaker and cold water spigot were not used on our Whirlpool Refrigerator.  When a complete piping replacement (galv. iron with PEX) suddenly made it possible to drink the water for the first time in 10 yrs without consequences, I resolved to hook up the refrigerator again.  The biolfilm established in the reservoir with the hiatus did not flush out easily so rather than fight it for a long time, I took the path of least resistance and replaced the reservoir completely.  The replacement was about a 15 minute job and we are so pleased to be drinking tap water with confidence again.  A note to explain:  Old house, old pipes, unoccupied for long periods,on a dead end of the water company line, biolfilm flourished.  Some bad customers were apparently well entrenched in the biofilm and multiple heavy chlorinations were to no avail.  Gave up and boiled drinking water for 10 years.