How many hours are allowed to analyze bacti samples?

Bacti samples, which are used to measure the presence of bacteria in water, must be analyzed within a specific timeframe to ensure accurate results. The correct answer indicates that samples must be analyzed within 30 hours. This duration is critical because bacterial growth can continue in the sample once it is collected, potentially skewing results if the analysis is delayed. Following the specified timeframe ensures that the assessment reflects the actual conditions of the water source at the time of sampling.

While the other options suggest longer timeframes, they do not meet the standards set by regulatory agencies for water safety and quality. Thus, adhering to the 30-hour limit is essential for reliable results in the monitoring of bacteriological contamination in water supplies.