The ornamental design for a waterfilter, as shown and described.
FIG. 1 is a perspective view of a water filter according the present invention;
FIG. 2 is a front view thereof
FIG. 3 is a rear view thereof;
FIG. 4 is a right view thereof;
FIG. 5 is a left view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines in FIGS. 1 and 3-5 depict portions of the water filter that form no part of the claimed design. The broken lines and areas within and adjacent to solid lines depict portions of the water filter that form no part of the claimed design. The dot dash dot broken line in FIG. 7 denotes the boundaries of the claim and forms no part thereof.