This water purifier uses a 0.5 micron filter with a charcoal block and U.V. light to purify your drinking water. Tests show that all bacteria, virus and harmful chemicals are removed, when the purifier is used according to instructions. The internal battery charge is good for about 6 hours use. A solar panel is available to keep the battery charged. The purifier shown is installed in a "Pelican Case". A slightly more compact version of the purifier designed for an ammo box is also available.