Constructed of polypropylene microfibers thermally bonded to each other, the filters are completely self-supporting, will not shed fibers and will not “unload” particles under pressure surges. Since the filters are 100% polypropylene, they are FDA compliant for food and beverage contact and have wide chemical compatibility. The unique computer-controlled manufacturing process ensures consistent performance and quality. The filter you buy six months from now will perform just like the ones you buy today. Also, because the filters are made continuously, you can get a filter in any length from 1-1/2 to 50 inches. This consistency and manufacturing flexibility, along with higherdirt-holding capacity and longer service life makes HYTREX II your best quality choice for depth filtration.