Pentair Pentek ECP5-BB Big Blue Sediment Water Filter, 10-Inch, Whole House Heavy Duty Pleated Cellulose Polyester Replacement Cartridge, 10" x 4.5", White End-Cap, 5 Micron, Pack of 2KEEP YOUR WATER CLEAN and protect your appliances by removing dirt, sand, silt and particulates FITS ALL 10" Big Blue housings or other 10" heavy duty housings and can replace any 10" x 4. 5" heavy duty sediment filter cartridge LONGER LIFE with 33% more dirt holding media than many competitors STRONGER than standard cellulose cartridges with a unique blend of resin impregnated cellulose and polyester REPLACE EVERY 6 MONTHS or when you notice a drop