Filter

FIG. 1 is a front view of the filter;

FIG. 2 is a rear view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is an opposite view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a bottom perspective view thereof; and,

FIG. 8 is an enlarged detail view thereof.

The broken lines depict portions of the filter that form no part of the claimed design.