This special straw will allow you to drink fresh clean water anytime, anywhere! It is the world’s smallest water filter in a straw (small enough to fit in your pocket) and reduces contaminants in water for up to 6 months. These include chlorine, fluoride, algae, fungus, scales sediment & E-Coli, as well as heavy metals such as lead, mercury, hydrogen, sulfidic aluminium, arsenic, cadmium & barium. It will treat 5 standard glasses of water a day for 4 - 6 months. The straw can be used for any situation like camping, travelling overseas in developing countries and in freshwater lakes & ponds - anywhere you want clean safe water to drink!