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The product shown is a bottle of Potable Aqua Water Purification Tablets, which use the active ingredient tetraglycine hydroperiodide (iodine) to make questionable freshwater bacteriologically safe to drink.How to Use Potable Aqua TabletsTo treat water safely using these germicidal tablets, follow this standard step-by-step procedure:Pre-filter the water: If the water is cloudy or contains visible sediment, debris, or dirt, strain it first through a clean cloth, coffee filter, or a pre-filter system.Add tablets: Drop 2 tablets into 1 quart (or 1 liter) of water.Wet the threads (Important Tip): Cap the container loosely. Wait 5 minutes, then shake the container so that some water leaks out onto the screw threads of the lid. This ensures any pathogens trapped on the bottle rim or lid threads are also exposed to the iodine.Tighten and wait: Secure the cap tightly and shake well. Wait at least 30 minutes before drinking. This 30-minute contact window is crucial for the active ingredient to fully neutralize microorganisms like Giardia and bacteria.Optional neutralizing (PA+): Iodine leaves a distinct taste and yellow tint. If you have the companion PA+ Taste Neutralizer tablets, add 2 of those per quart only after the initial 30 minutes have passed. Shake well, wait 3 minutes, and the water will be clear and ready.