Bag filter under the pressure, so that the liquid through the filter bag, filter bag retained by the pollutants retained in the filter bag, filter residue in the filter bag, the filtrate along the metal support network basket outflow , So as to achieve the purpose of filtration. Bag filter, suitable for paint, beer, vegetable oil, medicine, chemicals, petroleum products, textile chemicals, photographic chemicals, electroplating solution, milk, mineral water, hot solvent, latex, industrial water, sugar, Industrial wastewater, fruit juice, edible oil and so on.