What operation should be done to an entire filter during disinfection?

Disinfection of an entire filter is a critical process in maintaining water quality and ensuring the safety of drinking water. The recommended minimum disinfection level of 50 mg/L is established based on public health guidelines that aim to effectively eliminate pathogens from the filter media. This concentration ensures sufficient exposure to the disinfectant for effective microbial inactivation, thus minimizing the risk of waterborne diseases.

When filters are disinfected, it is crucial to achieve this specific concentration because it provides a balance between ensuring thorough disinfection and avoiding potential damage to the filter media or compromising the filtration process. Higher concentrations could lead to harmful effects on the filter's materials or alter the water chemistry in undesirable ways, while lower concentrations may not provide adequate disinfection, increasing the risk of pathogens surviving in the treated water.

Therefore, disinfection to a minimum of 50 mg/L is mandated to guarantee a high level of safety and efficacy in water treatment operations, particularly in public water systems that must adhere to stringent health and safety regulations.