Glass fiber filter felt thorn (bag / bag) formulated with reactive fluoride additives mixed working fluid impregnated filter, so that the working fluid and filter fibers macromolecular structure of certain groups react to form macromolecular chains, change affinity for the fiber with water, the oil can, to reduce the surface tension of the filter, down to less than the surface tension of water and oil, water repellent and oil in order to achieve the purpose. After a variety of media by the water repellent and oil processing, can form a molecular barrier around the fiber surface, to prevent the buildup of water and a variety of materials and penetration of oil compared with the general media, not only has water repellent and oil properties, but also for dust and made, also has anti-adhesive properties and ease of removability. The glass fiber filter felt thorn (bag / bag) is particularly suitable for wet areas of southern or filtration and air humidity occasion.