Product review (5 stars): Works great after proper installation and circulating water through filter until clear.
I bought this filter with trepidation after reading a few negative reviews but the price was a third of an OEM filter so I thought I'd give it a try. Since the filter has no markings and one reviewer had difficulty with lining up where to start, I put a mark on the top FRONT edge of my old filter with a felt tip marker before I removed it. I then twisted off the old filter a half a turn left without pulling down and removed it. I  then lined up the new and old filter and transferred the mark to the new filter. This will give you a reference point. I then put the new filter that I filled with water with the marked reference mark, and turned a half of a turn until locked. It's not necessary to push up or pull down when turning to remove or installing, this happens naturally. Presto no problem. The reference Mark helps in lining up old and new filter. One reviewer said black water came out after installing. This is normal since this filter is a charcoal filter. The original directions with my refrigerator directs to fill new filter with water after installing and to circulate water through filter for a few minutes until water stops sputtering after bleeding all air out and until water is clear, after charcoal residue is finally filtered out. Filter works great when installed properly and water circulated through it for 2-3 minutes after install. I highly recommend this filter.