Filtration system

FIG. 1 is an isometric view of an ornamental design for a filtration system;

FIG. 2 is a front elevational view of the filtration system of FIG. 1 ;

FIG. 3 is a rear elevational view of the filtration system of FIG. 1 ;

FIG. 4 is a left side elevational view of the filtration system of FIG. 1 ;

FIG. 5 is a right side elevational view of the filtration system of FIG. 1 ;

FIG. 6 is a top plan view of the filtration system of FIG. 1 ; and

FIG. 7 is a bottom plan view of the filtration system of FIG. 1 .

FIG. 8 is an isometric view of an alternative embodiment of an ornamental design for the filtration system depicted in FIGS. 1-7 ;

FIG. 9 is a front elevational view of the filtration system of FIG. 8 ;

FIG. 10 is a rear elevational view of the filtration system of FIG. 8 ;

FIG. 11 is a left side elevational view of the filtration system of FIG. 8 ;

FIG. 12 is a right side elevational view of the filtration system of FIG. 8 ;

FIG. 13 is a top plan view of the filtration system of FIG. 8 ; and,

FIG. 14 is a bottom plan view of the filtration system of FIG. 8 .

The broken lines showing the filtration system are included for the purpose of illustrating environmental structure and form no part of the claimed design. The stippling region provided between the dash-dot-dash lines in FIGS. 8-12 indicate tonal contrasts in appearance of the filtration system. The stippling does not represent any particular color, pattern, material, texture, or finish.