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What is one effective way to reduce unpleasant odors in a collection system?

  1. Installing air fresheners

  2. Routinely cleaning low-flow lines

  3. Covering manholes

  4. Reducing water levels

The correct answer is: Routinely cleaning low-flow lines

Routinely cleaning low-flow lines is an effective method for reducing unpleasant odors in a collection system. Low-flow areas can become stagnant, leading to the accumulation of organic materials that decompose and produce foul-smelling gases. Regular cleaning helps to remove this buildup, allowing for better flow and reducing the potential for odors to develop. In contrast, methods such as installing air fresheners might mask odors temporarily but do not address the underlying cause. Covering manholes can improve aesthetics and may contain some odors, but it does not effectively eliminate the source of the smell. Reducing water levels isn't a solution for odors since it could lead to more stagnation and issues with sewage flow, exacerbating the odor problem.