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The standard solution used in health care facilities for surface disinfection is a 1:10 solution of bleach and water (or a ~9% bleach solution). Some sources recommend discarding after one week, due to a breakdown in stability. For easy household mixing, add seven tablespoons of common household bleach to one quart of tap water.

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Q: Bleach spray for use in decontaminating surfaces one should combine equal parts of bleach and water?
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