LifeStraw Personal Water Filter make water contaminated with bacteria and protozoa safe to drink. LifeStraw water purifiers also remove viruses. They are durable, lightweight and require no electricity or batteries to operate. Removes minimum 99.99% of waterborne bacteria and waterborne protozoan parasites. Also LifeStraw filters up to 1000 liters of contaminated water WITHOUT iodine, chlorine, or other chemicals.