MECO Survival Water Filter Straw Personal Travel Water Filter Pen for Camping Climbing Hiking and more Outdoor Activites Removes minimum 99.9999% of waterborne bacteria (&gt;LOG 6 reduction) and surpasses EPA standards for water filters Removes minimum 99.9% of waterborne protozoan parasites (&gt;LOG 3 reduction) and filters to an amazing 0.2 microns Filters up to 1000 liters of contaminated water WITHOUT iodine, chlorine, or other chemicals Lightweight:Only 3 OZ,Convenience to take it anywhere. Warranty: 18 months Warranty, 40 Days Money back!