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How many types of filter cotton? Air filter cotton is physically filtered,Biological filtration is used for biochemical cotton.Filtration of biochemical Cotton: biochemical Cotton also has the effect of physical filtration,But the most important role is to cultivate nitrobacteria to break down harmful substances in the water.Air filter cotton specifications: large size,The common width is 0.8 m, 1.6 M, 2 M,14 m, 21 m in length,Thickness is 5mm, 10mm, 15mm, 20mm, 22mm, 50mm, 60mm.Biochemical Cotton: green, blue, black, standard color.Specification of biochemical Cotton: common size is 1 m wide,1 m long, 2 m long,38mm thick.Air filter Cotton: use synthetic fiber, fiberglass, activated carbon.The density of air filter cotton is greater than that of biochemical cotton,Close structure,Compared to air filter cotton,The density of biochemical cotton is large,More loose.The elasticity of biochemical cotton is better than that of air filter cotton.Air filter cotton,The service life is about half a