Product review (5 stars): Great filter, no knocking noise, awesome deal!!!
Works as advertised!  Great product.  I have a Samsung refrigerator with french doors, water filter goes in the bottom right corner with the door open.  Checked model number of the refrigerator to find the correct part number for the filter, and then compared filters on Amazon for price.  Changing filters every six months or so...  Originally bought another Samsung filter, then bought a different brand that worked great, then bought yet another brand, but a few months into that third filter the refrigerator started making knocking noises, probably getting air in the water line through a leak in the filter...  No water ever leaked, but the knocking sound was becoming very annoying as it began to occur more frequently over time.  Back to Amazon, bough this brand, and it's working great!  No more noise.  Just fresh, clean water.  Will buy several more now that this one confirms success.  Install was easy, twist and pull the old, twist and push the new, done in less than a minute.  No water leaks.  Perfect!