Abstract: A system for generating sterile water is provided, including: a liquid holding container having thereon a container outlet; a filtration device including therein a low-pressure-differential pathogen filtration portion, wherein the filtration device has a filtration inlet and a filtration outlet; and a gas tube; wherein the container outlet is connected to the filtration inlet; wherein the filtration inlet has a gas hole with one end connected to the gas hole and the other end having a buoy; wherein the sterile water is substantially pathogen-free.