Product review (5 stars): NSF 53 is the difference maker
Have mostly used the GE MWF filter, but also have tried the Water Sentinel WSG-1. Both work great. I'm now, however, only going to use the twice-as-much GE filter due to NSF 53 - removal of health related contaminates. Water Sentinel does not meet this standard. I've got well water and a full house filtration system, but one more safety item in my water is just fine by me. This single filter is $40 with tax (Prime; weird that a 3 pack is $140? I could order 3 separate orders of the single for $20 less??) but well worth the extra money if it provides safer water for me and the family.