Fibroxcel products are chemically inert complex filter aids, which are used in the filtration of wine and alimentary liquids. They are used in the formation of precoats and/or coats and for the continuous dosing filtration for the filtration of wine, beer and products difficult to filter such as musts, lees, sugar syrups, etc. Fibroxcel 10 is normally used as first precoat in brightening filtrations, in variable doses between 500-700 g/m2; for the second precoat the same diatomaceous earth is used as in Spindacel, which is used in the continuous dosing filtration.