There are many kinds of test kits available in the market to test drinking water. A simple and common Chlorine test can be done – OTO (Orthotolidine) Test. Fill a test tube of water from the tap that is not filtered, and another tube from filtered water. Drop a few drops of OTO solution in the test tubes. OTO will turn yellow when added to chlorinated water. The darker it turns, the more chlorine is in the water. If the chlorine level is really high, then the sample will turn brown. Being certified by NSF, a trusted independent consumer protection organization, consumers can be assured of the standards and that the claims are verified. (Please note that SoPure models are not NSF certified.)
