Exercise 28 covered the most probable number procedure and exercise 29 covered the membrane filtration method. Imagine you were given a water sample with a large amount of debris. Which method would you choose to test this water sample?
A) The most probable number procedure
B) The membrane filtration method
A) The most probable number procedure
Feedback: The membrane filtration method is a poor choice because the large amount of particulate would interfere with the filtration of the water. In the MPN procedure, the water is plated/diluted and added to the tubes; debris would not interfere with the bacterial growth.
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