The PDH20-20 Shelco MicroVantage PDH series is a high efficiency polypropylene depth filter cartridge. The PDA cartridge is rated with a 20 micron retention rating and is 90% efficient as this designated rating . This filter has a nominal length of 20 inches and is sold in case quantities of 24. PDH series are constructed with multiple zone gradient density fixed pore structure which maximizes dirt holding capacity. A polypropylene support core give this filter stability under higher pressures and temperatures. 100% polypropylene construction, meets FDA requirements. Recommended change-out differential pressure is 35 psid ( 2.4 bar). This product is made to order and is non-returnable.