The PDA20-10 Shelco MicroVantage PDA series is an absolute rated depth filter cartridge. The PDA cartridge is rated with a 20 micron retention rating and is 99.9% efficient as this designated rating . This filter has a nominal length of 10 inches and is sold in case quantities of 36. PDA series are lot traceable and comes with certificate of conformance. 100% polypropylene construction, meets FDA requirements. A polypropylene support core give this filter stability under higher pressures and temperatures. Recommended change-out differential pressure is 35 psid ( 2.4 bar). This product is made to order and is non-returnable.