Expedition Research LLC TAC-H2O - 100 Aquatab 49mg Water Purification Tablets - by Tac-Bar Tactical Food Rations Illustrated Tri-Fold Color Manual Included. Use one 49mg USA/UK/NATO/UN Mill-Spec Aquatab tablet for up to 5 litres of water. Up to 500L total of water treatment per TAC-H2O packet. Read and follow the instructions. Expiry 09/2022. Safety heat sealed in 4-layer 140 micron thick TAC-H20 Mylar pouch. Resealable zip-lock, waterproof, sunlight proof, rugged, compact and matte black. When the strips are out of the specilized TAC-H20, keep dry and out of direct sunlight for extended periods. Tablets which kill micro-organisms in water to prevent cholera, typhoid, dysentery and other water borne diseases. Water treated with Aquatabs is ready to drink in 30 minutes. Active ingredient (NaDCC): US EPA approved for long term drinking water treatment. EPA Reg No 71847-4