It has the used 100% PP/PE Bi-component fibers to create 3-Dimensional Skeleton Structures. It is the High Functional filter that maximizes the High Water Flow Rate and Removal Efficiency of the processed water and chemical solution. It also maximizes the combining power of each non-woven layers. It is the Heat-combination Chemical Free filter. The materials are on the FDA listed as acceptable things to be Portable and Edible. And it keeps a High-level cleanness.