1.liquid filter bag 2.Made from Nonwoven fabric 3.Acid-proof, alkali-proof,high stregth,good primary fiter bag. Liquid filter bagMaterial: PET ... cellulose fiberFeature:Acid-proof,alkali-proof,high strength,good primary filter bag.Usage: For sewage treatment plants,municipal drai nage projects ... woven fabrics to produce different specification and size drain filter bags depending on the circumstances.