Free Chlorine Testing

Adding chlorine to water is an effective method of killing disease-causing bacteria.  Testing is required to determine the appropriate amount of chlorine in system.  If you do not enough chlorine, bacteria will remain, or the water could possibly be recontaminated during storage.  If you have too much chlorine, the taste and smell of the water will be undesirable.  Free chlorine is the remaining chlorine available to inactivate disease causing organisms.

Spot checking and regular testing at homes is necessary to assure the system continues to work adequately.  The first pictures are of Keith Thompson going through the steps of testing the water at the home for “Free Chlorine”; taking the sample, adding the chemicals for the test and measuring the sample for “Free Chlorine” using the colorimetric test guide from the kit. You can see in the second picture that the bright red color indicated that there was excessive amount of “Free Chlorine” in the water, meaning that they were over chlorinating the water, but also that there were no harmful biological chemicals left in the water.

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The set of pictures below are of the staff members of San Jacinto doing the same tests as practice for future testing. The testing kit was left with the San Jacinto staff to both test for “Free Chlorine” in samples and to adjust the levels of chlorination in all of the distribution lines that were developed in these communities. The pictures in order show Keith Thompson explaining the test to Hernando Sagastume of the San Jacinto staff, Hernando mixing the chemicals with the test sample, showing the treated sample, placing the colorimetric wheel and the sample in the testing apparatus, reading the test results. The last picture is of an additional staff member reading the test results.

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