Quick Answer
To test rainwater quality after using a diverter, collect a sample from the storage tank and analyze it for pH, turbidity, and bacterial contamination. Use a pH meter and a turbidity meter to measure these parameters. Send the sample to a laboratory for bacterial testing if necessary.
First Flush and Sample Collection
Collect a 5-gallon sample of rainwater from the storage tank. Make sure to use a clean container and handle the sample carefully to prevent contamination. For accurate results, collect the sample after a 10-minute first flush from the gutter and diverter system.
Water Quality Testing Parameters
Test the pH level of the rainwater using a pH meter. A pH range of 6.5 to 8.5 is generally considered safe for consumption. Next, use a turbidity meter to measure the water’s clarity. If the turbidity is above 5 NTU (nephelometric turbidity units), the water may require treatment. Finally, send a sample to a laboratory for bacterial testing if you suspect contamination. A total coliform count of less than 1 CFU (colony-forming units) per 100 mL is generally acceptable.
Additional Considerations
For more accurate results, test the rainwater quality at different times of the year and during varying weather conditions. This will help you identify any seasonal or environmental factors that may affect the quality of your rainwater. Consider installing a UV treatment system or a sediment filter to remove any contaminants and improve the overall quality of your rainwater.
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