Replacement cartridge for HYPERFILTER filtration system. CAUTION: There is a pair of filters in the HYPERFILTER purification system. In order to obtain breathable air, it is necessary to insert a first filter with molecular sieve only and a second filter with molecular sieve and activated carbon or with molecular sieve, activated carbon and CO-Catalyst as needed. Available with: MOLECULAR SIEVE AND ACTIVATED CARBONThe right choice when you need to get breathable air. Molecular sieve removes moisture in the air, and activated carbon removes odors and any oil residue. MOLECULAR SIEVE, ACTIVATED CARBON AND CO-CATALYSTThe CO-catalyst, in addition to the molecular sieve and activated carbon, will allow dangerous Carbon Monoxide to be absorbed. Its use is indicated where combustion engines are present or in places where it is very likely to find an excessive amount of Carbon Monoxide. MOLECULAR SIEVEMolecular sieve, through porous micro granules, is used to absorb moisture. ACTIVATED CARBONActivated carbon is used to remove odors and oil residues. Activated carbon is sensitive to moisture, so to obtain breathable air, it is necessary to use activated carbon together with molecular sieve to remove moisture.