Pristine Water Treatment Tabs are a Canadian-made, low-cost way to make lake, river or suspect tap water safe to drink — for backpacking, canoe trips, the cabin, RV travel and emergency preparedness. Drop a tab, stir, wait 30 minutes, drink. Active ingredient: Sodium Dichloroisocyanurate (NaDCC) — a fast-dissolving chlorine-based purifier; no iodine, no aftertaste of iodine tabs Effective against: bacteria, viruses and Giardia 1L Tablets (8.5 mg): one tablet treats 1 litre of water — ideal for bottles, hydration bladders and personal use on trail 20L Tablets (167 mg): one tablet treats 20 litres — ideal for base camp, cabin, RV/motorhome and emergency water storage; one pouch treats up to 1,000 litres Wait time: 30 minutes after the tablet dissolves Certified to NSF/ANSI/CAN 60 · safe for children and pregnant women Resealable, waterproof pouch with tabs in protective foil strips for long-term storage Warning: intended for water treatment purposes only; harmful if swallowed directly. Keep out of reach of children. Restricted to a maximum use level of 10 mg/L under NSF/ANSI/CAN 60. Refer to product packaging for full directions.