FIG. 1 is a left side elevational view of the insert showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is an exploded view showing the fluid treatment cartridge and the inserts as they would be inserted onto side wall portions of the fluid treatment cartridge;
FIG. 8 is a partial bottom perspective view of the cartridge showing one of the inserts inserted onto a side wall portion of the fluid treatment cartridge;
FIG. 9 is a right side perspective view showing one of the inserts inserted onto a right side wall portion of the fluid treatment cartridge; and,
FIG. 10 is a front elevational assembly view showing the fluid treatment cartridge having the pair of inserts mounted upon diametrically opposite side wall portions thereof.