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Use regular unscented 5.25% household bleach. Read and follow the safety instructions on the bleach container's label. Never mix bleach with ammonia or any other cleaner. Wear rubber boots, rubber gloves, and eye protection. Try not to breathe bleach fumes. Open windows and doors to get fresh air.

For purifying clear water, add ~0.75ml bleach per gallon. Let stand for 30 minutes before consuming.

For purifying cloudy (ditch water) add ~1.5ml bleach per gallon. Let stand for 30 minutes before drinking.

I recommend that after the water has been sanitized and has settled for several hours, pass it through a charcoal water filter, to remove the excess chlorine. The Brita water filter will remove the nasty tasting chlorine from the water. A chlorine detection kit (available at your local pool supply store) will detect the levels. Just be careful not to add it to water you plan to drink, OTO is poisonous.

Info from CDC.gov

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Q: What is the ratio of bleach to water for purification?
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