The patented CRS cartridge filter design is available with single filter units, for custom contamination removal for specific applications. This uses the same replaceable cartridges as the Gas Purification System. The purifier is available with either 1/8" or 1/4" fittings, and comes with hardware for bench or wall mounting. Wall mounting is preferred where feasible, because cartridges are more easily replaced in this orientation. Regeneration service is available, except for the carbon dioxide cartridge which cannot be regenerated.