The GSWF model water filter comes in a factory original OEM model by GE and two aftermarket forms; Swift Green and Supco. The GSWF model filter can be used in a multitude of refrigerators. Such compatible refrigerators include GE, Amana, Hotpoint, and Kenmore. The factory original OEM GSWF by GE has been put through vigorous testing by NSF International; a global independent testing organization for public health. The factory original GSWF graded positively against Standard 42 and Standard 53. Such passing grades for these Standards ensure a number of positive qualities for this filter's utilization; reduction of chlorine taste, reduction of chlorine odor, particulate, cysts, lead, turbidity, and other potentially harmful chemicals in your water supply. This water filter should be changed every six months to ensure the highest filtration performance.