ChemWorld UltraPure Water exceeds ASTM, CAP and NCCLS Type 1 specifications and meets bio-medical grade specifications ASTM D5196. This product was created through a cartridge filter, carbon filter, dual mixed bed ion exchanged units, UV sterilization, then further processed to 18.2 megaohms and 0.2 micron filtered. The initial water source is Deionized Water and not Distilled. The Shelf Life is 24 months (Dependent on storage conditions.) Intended for industrial applications. Not for human consumption. 1 Gallon.