Water Factory ® 47-55706CM CoolerMate Composite Sediment / Carbon Replacement Water Prefilter by 3M Purification. Dual action sediment prefilter / carbon prefilter designed for chlorinated water supplies. Combines our dirt & rust water filter cartridge made from an exclusive process using pure white cellulose fibers and high-absorption GAC granular activated carbon. As water passes from the outer surfaces into the center of the cartridge, the filtering pores become increasingly smaller to remove even microscopic particles. Then chlorine and other organics are removed in the bed of granular carbon. 5 Micron Graded Density Sediment Prefilter for Optimal Dirt Holding Capacity. For use as the prefilter in CMRO-3TFC.