What is the objective of collecting a post-flush sample?

Collecting a post-flush sample primarily serves the objective of determining the cleanliness of the line. After flushing a plumbing system, assessing the water quality helps to identify whether any contaminants, such as bacteria (including Legionella), sediment, or biofilm, have been effectively removed from the system. The goal is to ensure that the water is safe for use and that the plumbing system is functioning as intended without harboring harmful organisms that could lead to health risks.

While measuring contaminant levels can also provide valuable information, determining cleanliness involves understanding whether flushing was sufficient to restore or maintain water quality to acceptable standards. This assessment reflects the system's efficacy in achieving a safe environment for water distribution.