What unit of measure is indicated by colony forming units?

Colony forming units (CFUs) are a measure used in microbiology to estimate the number of viable microorganisms, particularly bacteria, in a sample. This measurement represents the number of colonies that develop when a diluted sample is plated on a growth medium. Each colony typically originates from a single bacterium or a cluster of bacteria that can grow into a colony under the right conditions. Therefore, the correct interpretation of CFUs directly quantifies the number of living bacteria present in the sample, making it essential for assessing microbial contamination and evaluating water quality in systems like those managed by Fresenius. Understanding this concept is crucial for ensuring safety and compliance in water quality management and treatment processes.