The Lifesystems Chlorine Tablets are effective and very easy to use. Killing off most viruses and bacteria, chlorine is used as a disinfectant. These tablets treat up to 60 litres of water, making it safe for use. You could even brush your teeth with the water it's so clean!FeaturesContains 60 foil sealed tablets - Will treat up to 60 litres of water.Part of the DofE Award recommended kit which features on the DofE Expedition Kit ListKills bacteria, viruses and cysts in water - Including Giardia and Cryptosporidium.No after taste - Pleasant to drink.