Product review (4 stars): Perfect replacement for MWF
This filter went in in a flash (took 30 seconds), was a perfect fit in my GE fridge model PSS23MSTCSS SS, and water tastes great.

No instructions came with the new filter, and the new filter doesn't have an alignment arrow.  Here's what to do : Rotate old filter left (about a 1/4 turn), and pay attention to the old filter rotational position when it pops out (no need to pull down on the filter when removing, it will drop down when free).  There are two "wings" sticking out on the top filter flange (see pic).  Align the new filter the same way when you hold it up into the holder in the fridge and turn to the right slowly about a 1/4 turn.  Presto !

Note : Fridge manual instructions say to fill the new filter with water before installing.  When filling, water will slowly drain into the new filter and bubbles will come out, so it needs to be filled a few times to become full.