Product review (3 stars): You need to know the trick or it won't "seat" properly.
After 45 minutes of trying to get this product to click into place I started reading the 1 and 2 star reviews.  What I found was that the lower o-ring is too big or too flexible and gets bunched up inside the housing. I switched the o-ring from the old filter, which was a genuine LG filter LT700P, to the new cheap filter and it clicked right into place.  Not sure about water quality yet but I did flush the filter for 5 minutes which was recommended.  Hope this helps somebody.