Russell Bateman June 2021 last update:
This is for Samsung model RF28R7201SR, serial number 0B2C43BMB00790V.
The replacement water filter link is an Amazon: Waterspecialist DA29-00020B Samsung Water Filter for Refrigerator, Replacement for DA29-00020A/B, HAF-CIN/EXP, DA29-00020B-1, RF25HMEDBSR, RF28HMEDBSR, RS25J500DSR&More Models, 3 Carbon Filters.
It's for 3 filters, cost $29.98.
For a couple of years, frustratingly, the water dispensed so slow as to require nearly 1 minute to fill a 12-ounce glass. Changing the filter didn't solve it. Ultimately, it was necessary to pull the refrigerator out from the wall. We removed a filter in a cabinet that had kinked the line (the filter was in-line and put there for the original refrigerator). Splicing out the kink did not help. Fiddling with the valve in the wall behind the refrigerator, however, did solve the problem. It would seem that the repairman who came under warranty had created the problem inadvertently.
This was difficult. Normally, open both door and tug on their handles usually works. Ultimately we snaked a web strap around and two of us pulled it out. It was unclear why or on what it was stuck.