Potable Aqua tablets provide purified drinking water PA Plus tablets remove iodine taste and color Treats up to 25 quarts contains 50 tablets Easy to use.Potable Aqua Water Purification Tablets w/PA Plus-50 Tablets Used worldwide by campers, hikers, militaries, emergency responders, and anyone else who needs to drink water from a questionable source, Potable Aqua iodine tablets will disinfect contaminated drinking water in a pinch. The tablets - which are intended for short-term or limited emergency use only -make most water bacteriologically suitable for drinking, proving effective against Giardia lamblia when used as directed. Each Potable Aqua tablet contains 20 mg of Tetraglycine Hydroperiodide (TGHP), which liberates 8 mg of titratable iodine when released into water. Within 30 minutes, the iodine will have penetrated the cell walls of the microorganisms, rendering them inactive and making the water bacteriologically suitable to drink. Potable Aqua Plus Tablets neutralize the iodine aftertaste and color, improving the taste of your drinking water.