Product review (1 stars): Don't buy single filters from Filter King - defective center, possibly a knock off or passing off manufacturing defects online
I purchased 4 single/individual Samsung Replacement Cartridges (Model # DA29-00020B) from Filter King for our Samsung French Door refrigerator recently.  The single filters were strangely cheaper than buying a multipack of 3 - that should have been a red flag for what's to come!  I have purchased from other companies thru Amazon.com usually in a 3pack, and have not had problems.  All 4 new filters purchased from Filter King thru Amazon.com did NOT work - loud vibrations, and product did not align at the right angle!!
  I opened the box for the first filter and noticed that there were no instructions or monthly date code stickers contained within - odd, but the cartridge filter was shrinkwrapped new.  I followed the instructions for installation of the filter as I had done in the past at least a half dozen times without issue on our Samsung refrigerator.  Immediately noticed that the arrow on the filter did not perfectly align at 12:00, as they did on the filter just de-installed  alignment was off by perhaps 1/8th of inch, I'd say it was stuck at 11:57 - I didn't want to overtorque it and break something inside the refrigerator.  Turned the water on to the fridge and began the process to flush water through the system as instructed.  No water came out and very audible vibrations could be heard.
  Turned the water to the fridge off again and de-installed this filter and tried a second new one  this one was also shrinkwrapped, and unlike the first did contain the instructions & stickers.  However, the same misalignment was seen in the 2nd cartridge filter, stuck at 11:57 (not fully vertically aligned) and the same result was obtained  - No Water through the system and Audible Rattling.  Decided to reinstall the old filter that we were trying to replace and found it to lock in place just fine (arrows correctly aligned at 12:00) and saw that water properly flowed through the system.
  De-installed this filter and closely compared it the two new ones  paying close attention to the open end  the end which engages the water nozzle inside the fridge.  The old (working) filter was shown to have the center circular piece on the open end to be flush with the rest of the nozzle end, meaning they were the same length.  This was in contrast to the other two new (non-working) filters in which the center circular piece was not flush  rather it was depressed in by ~1/16th of an inch.  It looks like I got a whole batch which were manufactured defectively and missed Quality Control standards.  Decided to open the last 2 new filters and found them to be in the same state as the other 2 non-working filters (would not lock in place in the fridge and the center circular piece was not flush with the rest of the nozzle end).
  I believe all 4 of the new filters are defective  they all seem to have the same serial code 'A2442'  suggesting that they could have come from the same bad manufacturing lot.  If the price is too good to be true, it's likely a rip off!!  These 4 filter rejects are all going back to amazon.com and I am buying elsewhere from a brick and mortar, big name place.