Constructed Of Melt-Blown Polypropylene Fiber Media, Poly-Ray Pleated Filter Combine Exceptional Solids Holding Capacities With Precise Micron Ratings Than Depth Filters. The Double Sheets Of Melt-Blown Media Are Layered To Provide Absolute Particle Retention, High Solid Loading And Long Service Life. Poly-Ray Filter Are Also Designed For Membrane's Pre-Filtration.