Product review (3 stars): DONT FORCE THE FILTER TIL YOU TRY THIS!
I also just purchased these filters. My after market filter leaked. I tried to put the newly purchased filter in and I couldn't get it to go in. I cussed and researched and almost tried forcing it in. I didn't want it to leak again so I researched some more. I found a link at support-us.samsung.
It explains there are a couple of locking collars inside the filter housing that are not lined up correctly because of the old filter. The easy fix is to take the old filter and install it. Then slowly take it out pressing up on the filter and turning about 1/8" past the lock marks. I did it twice to make sure the collars were aligned properly. Then I stuck the new filter in with no problem, no force. Then I cussed.

For the record, I took a pic of the housing and I do not know what the collars locks look like. But whatever happened it worked.