cellulose, powdered cellulose, microcrystalline cellulose, cellulose derivates, natural fibers containing cellulose and being in their natural state, in a processed state and/or in a treated state, wood chips, wood shavings, wood fibers, wood powder, all aforesaid goods for professional and industrial purposes and particularly as filter masses, filter layers, filter adjuvants or as parts of these goods; filters for fluid media