There are really only a few accepted methods of treating tap water. These include carbon filtration using granular activated carbon (GAC), reverse osmosis, distillation, ceramics, or exposing the water to ultra-violet light or ozone. Deionization is another common (but often costly) solution most often used in laboratories where purified water is essential for accurate experimentation. Each of these methods has strengths and weaknesses.

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— Methods Used To Treat Drinking Water