The carbon filter cartridges contain a high grade activated carbon that effectively absorbs most organic and inorganic vapors, including, but not limited to, xylene, formalin, methanol, toluene, and isopropyl alcohol. The filters are an alternate to brand-name original carbon filters and perform the same, if not better, at a fraction of the cost. The sizing and fit is identical to brand name cartridges. Manufacturer: Leica. Model: Tissue Processor ASP300/ASP300S . Use: 3 months .