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The ornamental design for spa filter, as shown and described.
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FIG. 1 is a perspective view of the spa filter;
FIG. 2 is a first end elevational view thereof, with the opposite end being a mirror image thereof;
FIG. 3 is a side elevational view thereof with the opposite side being a mirror image thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
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