Product review (2 stars): A Mess of Samsung's Own Making
What a mess. Samsung is shipping out their redesigned "three teeth" filters and putting them in discontinued "two teeth" filter boxes accompanied by "two teeth" filter instructions. Is Samsung so hard up that they have to use up their supply of old boxes and outdated instructions? To add insult to injury, their instructions also state incorrectly that the refrigerator (mine is an RS22HDHPNSR) filter housing has an "indicator line" (or in Samsung parlance, a notch) in the shape of a downward pointing arrow. Wrong. My refrigerator filter housing has a long, horizontal, very-fine-line arrow pointing from a "lock" icon at 6 o'clock to an "unlock" icon at 9 o'clock. No indicator line, no notch. I talked to two Samsung reps and, as nice as they were, they couldn't help me because they were looking at inaccurate/out of date instructions also.  It didn't take me long to figure out I was on my own.

I did manage to install the filter and get it working properly.  The filter needs to be inserted into the filter housing with the "lock" icon ON THE FILTER aligned just to the left of the "unlock" icon (at about 10 o'clock) ON THE FILTER HOUSING.  Turn the filter counterclockwise approximately 1-2 inches and it will catch.  Then, using considerable pressure, continue turning the filter counterclockwise until the "lock" icon on the filter aligns (more or less) with the "lock" icon on the filter housing.  You should hear a small burst of water run through it.

C'mon, Samsung, update the instructions in the box or at least give your customers a link to updated instructions.  And for heaven's sake, give your poor phone reps some updated instructions. Don't hang them out there to dry.

All in all, this was (and still is) exceptionally bad customer service.  Samsung, what are you thinking???