Allied troops in World War I were supplied with masks equipped with cotton pads soaked in urine because it was believed the ammonia in the urine would neutralize the chlorine gas used by German soldiers. Chlorine dissolves in the water portion of the urine, reacting with urea to form dichlorourea. While I'm sure you'd rather have an actual gas mask in the event you are exposed to chlorine, now you know how to make your own emergency filter.
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