What does screw chlorine refer to in the context of Cryptosporidium treatment?

Screw chlorine refers to an ineffective treatment method for Cryptosporidium, a waterborne pathogen that can cause gastrointestinal illness. Unlike other contaminants, Cryptosporidium has a protective outer shell that makes it resistant to chlorine disinfection. As a result, using chlorine alone is not effective for eliminating this pathogen from water supplies. This characteristic of Cryptosporidium necessitates the use of more advanced treatment options, such as filtration and UV disinfection, rather than relying solely on chlorination. Understanding the limitations of chlorine in controlling Cryptosporidium is crucial for water operators in ensuring the safety of drinking water and the health of the public.