Abstract: The invention relates to a method for reducing the total bacteria count in aqueous dispersions by means of sterile filtration of said dispersions using deep-bed filters (18, 22) pertaining to at least one deep-bed filter device, under pre-determined conditions, notably the temperature of the non-filtered part, the differential pressure in the deep-bed filters (18, 22) and the flow speed of the non-filtered part in the respective deep bed filter device.

Abstract: The invention relates to a method for producing a filter material, particularly in the form of a deep filter layer, comprising a given number of native fibers made of cellulose for example, and toxically active or toxicity promoting polyaccharides provided in a suspension before being further processed to form the finished filter material. By adding specific enzymes, the respective polysaccharide is converted into a non-toxic end product or an end product having low toxicity. As a result, the respective (lipo)polysaccharide chain is cleaved at given binding points according to the enzyme used and is degraded to form a non-toxic or low toxic end product.

Abstract: The invention relates to a method for reducing the total bacteria count in aqueous dispersions by means of sterile filtration of said dispersions using deep-bed filters (18, 22) pertaining to at least one deep-bed filter device, under pre-determined conditions, notably the temperature of the non-filtered parts the differential pressure in the deep-bed filters (18, 22) and the flow speed of the non-filtered part in the respective deep bed filter device.