Filtering is the final step in removing suspended matter and chlorine-resistant microorganisms.

Filtering is the final step in removing suspended matter and chlorine-resistant microorganisms.

• A. False
• B. True
• C. It is optional
• D. It is the first step

Answer: (B)

The key idea is how a conventional water treatment train uses filtration as the last physical barrier before disinfection. Filtration removes the remaining suspended solids and is also the primary means of physically removing chlorine‑resistant microorganisms, which chlorine alone may not reliably inactivate. Since some microbes (like certain parasites) resist chlorine, they must be removed by filtration to ensure they’re gone from the supply. After filtration, disinfection then inactivates any remaining microbes and provides a residual disinfectant, but the actual removal of suspended matter and chlorine‑resistant organisms occurs at the filtration stage.

The key idea is how a conventional water treatment train uses filtration as the last physical barrier before disinfection. Filtration removes the remaining suspended solids and is also the primary means of physically removing chlorine‑resistant microorganisms, which chlorine alone may not reliably inactivate. Since some microbes (like certain parasites) resist chlorine, they must be removed by filtration to ensure they’re gone from the supply. After filtration, disinfection then inactivates any remaining microbes and provides a residual disinfectant, but the actual removal of suspended matter and chlorine‑resistant organisms occurs at the filtration stage.