2.5″ x 10″ – 1 Micron Purtrex Depth Sediment Filter. Purtrex Depth Sediment filters are true graded density filters that trap larger particles at the surface and smaller particles towards the center. They are designed for long life, high purity, and low change-out frequency, featuring GE Osmonics patented melt blown microfiber technology. Purtrex meets FDA requirements for food and beverage contact and is made from 100% pure polypropylene with exceptional dirt-holding capacity. Filter incinerates to trace ash for easy disposal.