First you have to use the ...

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First you have to use the sedimentation Technic using settling tanks by adding coagulants and chemical agents to speed the process.

Second take the from the surface through weer channels to a sand filter for filtration and collect in a filtered water tank, than adding a small dose of chlorine for disinfection.

Third, take a sample for laboratory testing to make sure the quality is within standards.

Fourth, it should be ready for drinking.