AFseriesprimaryeffectfiltersponge,afilterspongewithalternateblueandwhite,ismainlyapplicabletocollectingthelargerdustmoleculesintheairtopreventthemediumfilterfrombeingfilledandblockedwithlargerdustssoearlyandtokeeplongservicelifeandbetterfiltrationeffectofmediumeffectandhighefficientfilter.It'smakeofsuperhardfiberandissprayedwithakindofadhesiveevenlyforstrengthening.Thereforeitshardnessanddensitysurpassthesimilarproducts,andthusithasbetterprimaryfiltrationeffectsandlargerairflow.)