Which of the following is NOT a function of a filter in water treatment?

In the context of water treatment, a filter serves several important functions that focus primarily on the removal of impurities from the water. One of the main roles of filtration is to remove solids, which includes suspended particles and debris that can affect both the appearance and safety of the water. This process is crucial for ensuring the water meets quality standards.

Filters also help to reduce turbidity, which refers to the cloudiness or haziness of the water caused by large numbers of individual particles. By effectively trapping these particles, filters play a significant role in improving clarity and overall visual quality.

Furthermore, filters contribute to improving the quality of drinking water by removing various contaminants, thereby making the water safer and more palatable for human consumption. This comprehensive filtration process is essential in maintaining water safety and compliance with health regulations.

In contrast, the addition of nutrients to water is not a function typically associated with filtration systems. While some water treatment processes may involve enriching water with certain nutrients for specific purposes (such as in aquaculture or agricultural settings), this is not a role performed by filters in standard water treatment contexts. Therefore, adding nutrients does not align with the primary objectives of filtration in water treatment processes.