Compact Pocket Water Filter Ideal for camping, hiking or any outdoor activity where you need to purify the water that you have access to. It is extremely compact and lightweight. It improves the taste of your drinking water as well as removing living micro-biological pathogens such as Cholera and E. coli, organic microscopic pathogens, pesticides, heavy metals, chlorine and other impurities. Replacement cartridges are available and the cartridge life span is dependent on the Water Source but should provide 1000 litres of drinking water.