nonwoven pocket bag filter 1)Prolonged service; 2)Nontoxic, odorless; 3)Refined filter structure; 4)Super air flow; Multi-colour Dust Filter Bag, Dust Bag Filter : Made by polymer and compound fabrics. Not only does the materials have three-dimensional net structure, but also forms rough, fine filter layers and intensive layer and embodies the integral advantages of multi-stratification and ...