Katadyn Pocket Water Filter for Backpacking Group Camping &amp Emergency Preparedness | 13000 Gallon Capacity 20-Year Guarantee For Survival Emergency Preparedness &amp Expeditions

- Material: aluminum, stainless steel, silicone, ceramic - Purifying Element: silver-impregnated ceramic filter - Eliminates: protozoa, bacteria, cyst, algae, spore, sediment - Filter: ceramic depth filter - Pore Size: .2 microns