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of chlorine and let it stand for another 15 minutes.
Household iodine is also used to purify water. Use iodine that is two percent USP (United States Pharmacopoeia) strength. The amount for disinfection is 20 drops per gallon for clear water. Let the water stand for 20-30 minutes.
If the water is cloudy, double the amount of iodine. If the water is cold (below 50 degrees Fahrenheit), wait at least an hour. Iodine can cause the water to have an off-taste. Stores catering to hikers and campers, or drug stores usually carry chlorine or iodine in tablet, crystal or drop form to use for disinfecting water.
If there is advance warning of an emergency, the water in the household plumbing system can be protected from contamination and available for use.
First, shut off the main water valve into the home. This prevents any contaminated water from getting into the home. Also, shut off the valves on any water lines leaving the house, such as an outside faucet. Open a faucet in the highest point (such as an upstairs bathroom) in the house to let air into the system. Then draw water as needed from the lowest faucet (such as a laundry room sink) in the home.
Water in the hot water
97.6%