Watts - WPC Series - 20" x 4.5" Pleated Sediment FilterWatts WPC Series 20" x 4. 5" Pleated Sediment Filter Synthetic pleated cartridge with washable media, superior dirt capacity, and lower pressure drop than wound or spun alternatives 100% Synthetic Washable & Reusable Cellulose Free WHY IT WORKS Pleated Design Outperforms Depth Filters Increased Surface Area Pleated construction delivers significantly more filtration surface than wound or spun cartridges, resulting in greater dirt holding capacity and