Product review (4 stars): Poor Quality Control, Superb Customer Service
The new filter wouldn't seat and I suspected it had the wrong (too large) gasket.  Since the original filter didn't have a gasket, I seated the new filter without the gasket and got a shower.  At that point I submitted a complaint to Amazon along with a picture of the filter and the gasket.  The Company president responded the same day saying the picture confirmed the wrong gasket had been shipped.

He immediately reversed the original charge and sent a replacement (with the correct gasket).  The filter installed easily and the water was immediately clear.  Customer service was superb, I reduced a start because of the hassle.