Water Purifier (liquid) ( in a 4 oz bottle) almost 5 fl. Oz when full -- No activator is included.
Chlorine dioxide has been used for 80 years by city water supplies, travelers, camper and hikers as water purification for drinking water.
NOTE: If you want it with an activator -- get the citric acid or buy a kit. Use lemon jusic for 3 minutes to activate. Thanks!