Product review (5 stars): If your filter doesn't work you've probably bought the wrong model.
Purchased wrong filter.  Oops.  For everyone complaining that the new filter doesn't work, or doesn't work as well as your old one, I bet you did the same thing.  GE sells a MSWF and a GSWF filter, check to make sure you've bought the right one.  Seller is taking my mistake back though, so five stars for customer service.  Hopefully new one will work well because its been far too long since the filter was replaced.