Pure Hydration Type 58 Water Purification Bottle is the military version of the Aquapure Traveller water purification system. The Type 58 bottle has been proven to kill viruses and bacteria as well as removing cysts and spores, such as Cryptosporidium and Giardia. It will also remove toxic chemicals and heavy metals, bad taste, colour and sediment. The replaceable filter cap will purify on average 350 litres of water during its lifetime and is the only portable water purifier officially endorsed by the Hospital for Tropical Diseases London. The bottle body is impregnated with an FDA approved antimicrobial to stop the growth of microbes on the surface of the bottleJust fill the Aquapure Type 58 bottle from any fresh water source, screw on the cap and shake. Wait 15 minutes and the water is safe to drink. This bottle is also compatible with UK MOD PLCE webbing.