Harmsco’s activated carbon cartridges outperform “canister” and “impregnated” types of cartridges due to their increased carbon content, cellulose-free construction, wet molding process and dual-stage construction. 1.5 GPM max flow rate. 24 per case. HIF 7, HIF 14, HIF 16, HIF 21, HIF 24, Filter Housings, Harmsco Up-Flow High-Capacity Filters HIF 42, HIF 75, HIF 100, HIF 150FL, HIF 200FL, Harmsco Band Clamp Filters BC4-1-T-EP, BC4-2-T-EP, BC4-3-T-EP, BC6-1-T-EP, BC6-2-T-EP, BC6-3-T-EP Priced and sold individually. Order a case and save even more.