Process for production of anionically charged filter media sheet including pretreatment of filter elements with cationic charge modifier, preferably, employing inorganic colloidal silica charge modifiers. The resulting filters are used for the removal of haze or haze formers from beverages....http://www.google.fr/patents/US4645567?utm_source=gb-gplus-shareBrevet US4645567 - Filter media and method of making same
