The GE SmartWater MSWF Fast Fill filter is a long slim twist to lock filter mounted inside the refrigerator section above the top shelf. Replacement water filter for GE side-by-side refrigerators beginning with 2007 model year. According to GE, the MSWF Smartwater filter meets the NSF | ANSI standard 42 for the reduction of 97.0% of Chlorine, 99.14% of Particulates Class I. In fact the GE MSWF Smartwater filter meets the NSF | ANSI standard 53 for the reduction of 99.3% of Lead, 99.99% of Cysts, 98.54% of Turbidity, 99.6% of Asbestos, 94.7% of Mercury, 99.34% or Alachlor, 94.22% of Atrazine, 99% of Lindane, 98.32% of 2, 4-D, 93.44% of Toxaphene, 96.51% of Benzene. 98.78% of Carbofuran, 99.78% of 1,4 Dichlorobenzene. The NSF International is the internationally recognized authority on water quality. This is a newest filter from GE and is not a replacement for any other filter.