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KRPLUS Big Blue Carbon Water Filter, 20-Inch, Whole House CTO Carbon Block Replacement Cartridge, 20" x 4.5", 10 Micron KRPLUS Cartridges are a modified version of our ES Series Cartridge. An economical price makes this cartridge suitable for taste, odor and chlorine taste & odor reduction, as well as sediment filtration. These cartridges are protected by an outer wrap designed to significantly increase the useful life of the cartridge by trapping sediment that typically plugs carbon block cartridges. KRPLUS Big Blue Sediment Water Filter, 20-Inch, Whole House Heavy Duty Dual-Gradient Density Spun Polypropylene Replacement Filter Cartridge, 20 inch x 4.5 inch, 5 Micron, White. PP Cartridges are manufactured from 100% pure polypropylene and are sized for use in Big Blue Filter Housings (and other heavy duty filter housings). The larger diameter of the filter reduces the particle load, allowing it to operate at higher velocities.