2 1/2" x 9 3/4" 155001-43 Pleated Cellulose

Nominal 20 micron filter that helps reduce sediment , rust, silt, and other particles. Also known as Culligan S1, US Filter S1, American Plumber W20CL, Ace Hardware # 49641, True Value # 614-800, GE FXWPC, Omni RS1, D0403220.

Replace every 4 months or 16,000 gallons.