The SureAqua Straw Plus is a portable and lightweight water filter used to provide safe drinking water by removing bacteria & viruses. It is fitted with a special membrane which uses microfiltration technology of 0.1 microns which exceeds the US CDC recommendations. It will protect against water born bacteria and protozoa found in both tap & fresh water supply in many countries. When used in accordance with the operating and maintenance instructions it filters out 99.99% of water born bacteria including Giardia and Cryptosporidium. The straw plus is re-usable, filtering up to 1000 liters (264 gallons) of water with a safety cut off when its reached its filtration limit.