Product review (1 stars): Filter is not a compatible MWF filter
I purchased this 6 months ago when I installed the last MWF filter that I had on hand. I tried to install this Refresh MWF filter today, and it wouldn't fit. Comparing it to my old filter, the opening where the O-rings enter the filter is smaller than on the old MWF replacement filter that was being replaced. You can't return the product more than 1 month after ordering, so be certain to open the package and test it to be certain that it truly is a compatible MWF replacement.