Refrigerator Filter

FIG. 1 is a top front perspective view of a refrigerator filter showing my new design; FIG. 2 is a bottom rear perspective view thereof; FIG. 3 is a front elevation view thereof; FIG. 4 is a rear elevation view thereof; FIG. 5 is a left-side elevation view thereof; FIG. 6 is a right-side elevation view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; and, FIG. 9 is a top front perspective view, shown in an environment of use. The broken lines shown in FIGS. 1 and 7 depict portions of the refrigerator filter that form no part of the claimed design. The broken lines shown in FIG. 9 depict environment and form no part of the claimed design.