Product review (1 stars): Caution: does not filter lead, other impurities
Caution, the Water Sentinel WSG-1 product is not a direct replacement for GE MWF water filter. The WSG-1 meets only NSF/ANSI Standard 42 for aesthetic affects, while the MWF also meets Standard 53 for health effects, reducing substances including cysts, lead, and mercury.

Also, the WSG-1 did not fit in my GE Profile refrigerator. I returned the WSG-1 units I ordered.