The Sterling 5 micron spun polypropylene filter cartridge is manufactured with melt blown technology into a multi-layer structure to provide superior filter efficiency, pressure drop and cartridge life. Sterling Spun Polypropylene Depth Cartridge Applications Standard Specification Meets most of the Housings in the Market. General Industrial RO Systems, Food and Beverage, Commercial and Home RO System Use. Sterling Spun Polypropylene Depth Cartridge Features 100% Polypropylene Construction Micro-Fiber Design With Stands High Pressure Differentials Provides Depth Filtration Maximum Temperature 140"F Individually Shrink Wrapped