Micropur Forte PowderKatadyn Micropur Forte disinfects clear water and keeps it germ free for up to 6 months. Due to the strong oxidising power of chlorine, most protozoa and fungi are eliminated as well as bacteria and viruses. Effect: eliminates bacteria and viruses after 30 minutes of contact. Storage: Store in original packaging in a dry place under 25C Shelf life: 3 years from date of manufacture Katadyn Micropur Forte can be used wherever microbiologically unsafe