Materials of organic origin, ZEOLITES are distinguished through their elevated and selective property of cationic exchange and have the capacity to neutralise, by keeping them internally in their own structure, leached elements such as ammonium, heavy metals and organic molecules. In addition to that, they are absorbing bad smelling gases like ammonia, hydrogen sulphide and the mercaptans – they are reducing also the emission of odours produced by biomass conversions exhausting from the cots or other similar buildings.