Pack of 3x 10-micron Pleated Sediment Filters Pleated filters are made from spun-bond, polyester fabric. It has been pleated to maximize the surface area for filtering the water. Pleated filters can filter large amounts of water at a high flow-rate without causing a drop in the water pressure. Pleated filters are also available in a wide range of micron-sizes. These filters are fine enough to remove even the smallest sediment particles. What's in the box 3x 20 inch Big Blue (20x4.5" size) Pleated Sediment Filters