Package of 20 tablets. Each tablet treats up to one liter of water. Active ingredients: Sodium Chlorite (6.4%), Sodium Dichloroisocyanurate Dihydrate (1.0%). Kills at least 99.99% of bacteria (Klebsiella Terrigena) and viruses (Poliovirus and Rotavirus) and 99.9% of cysts (Giardia Muris and Cryptosporidium Parvum) within 4 hours. Improves taste and odor of treated water.