Product review (1 stars): BUY YOUR FILTERS AT YOUR LOCAL HARDWARE STORE INSTEAD
This filter is defective.  After installing this filter our water started tasting like rubber and plastic.  We had a Whirlpool tech come out thinking that there was something wrong with our water line.  This was not the case.  He checked our filter and said that it is known that filters that have been kept shelved before selling can "go bad".  He sees it quite often when people order through the internet to save a few dollars.  We removed the filter and went out and bought another $49 filter and inserted it.  The water is now being filtered correctly and through a "working" filter.  Buyer beware.  Maybe ordering through Amazon is not the way to go  Just go to your local Lowes/Home Depot and purchase one.  Can't return it because the window for returning already passed us by unfortunately.