Flood water entered my borewell

What's is the immediate solution to use the water?

Last night there were heavy rains in my area and suddenly storm water surged in and filled up my sump tank and borewell with contaminated storm and sewage water. What is the immediate action I need to take to be able to use the borewell water (not for drinking)? Do I need to put some powder to make it safer for use?

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