Micropur MP1 Water Purification Tablets are an effective treatment against bacteria, viruses and cysts such as Cryptosporidium and Giardia. These are a lightweight, portable tablet great for traveling to areas where drinking water may be questionable. One tablet will treat 1 liter of water in 4 hours making the water suitable for drinking. Micropur will improve the taste and odorof the drinking water. Made in Germany.