EPA is aware of this potential difference between the EPA and Red Cross instructions for emergency disinfection. In the EPA instruction, we recommend 8 drops of 4-6% bleach per gallon of clear water. But we also recommend that the amount of chlorine be doubled for cloudy, murky or colored water or water that is extremely cold because disinfection is less effective in cloudy, murky or colored water and under low temperatures. It is better to filter murky or cloudy water through clean cloths, allow it to settle, and draw off the clear water for disinfection. Red Cross’ recommendation of 16 drops per gallon is more conservative and may be established based on a worse-case scenario.
While attempting to figure out how to properly disinfectant my water, I noticed EPA's steps for Emergency Disinfection differs from the Red Cross. Why is that?
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