Pentair OMNIFilter RS18 Sediment Water Filter, 10-Inch, Whole House Heavy Duty Spun Polypropylene Replacement Cartridge, 10" x 4.5", 50 Micron , White OMNI Filter's RS18 heavy-duty whole house spun polypropylene cartridges are used for the reduction of sand, dirt, sediment and rust particles. Help to protect your plumbing and appliances from getting plugged with sediment, causing costly repairs. They are a cost effective solution for homes with sediment problems and can be used on chlorinated or non-chlorinated water supplies. Features KEEP YOUR WATER CLEAN and protect your appliances by removing dirt, sediment and rust particles DESIGNED TO WORK BEST WITH OMNIFilter BF7, BF9C, BF35 and BF36C filter systems; Fits All 10" Heavy Duty Housing and can replace any 10" x 4.5" sediment filter cartridge GRADIENT DENSITY DESIGN TRAPS SEDIMENT within the cartridge not just on the outer layer for better flow rates and reduced pressure drop MANUFACTURED WITH 100% PURE POLYPROPYLENE and is suitable for use on municipal or well water supplies 30,000 GALLON CAPACITY. Replace every 6 months or when you notice a drop in water pressure or water quality USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.