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Convert colonies on a membrane to CFU per 100 mL of water.
Note
Count = 24 × 100 / 50 mL = 48 CFU per 100 mL.
Reference: Membrane filtration methods for water (e.g. ISO 9308-1, APHA 9222). Always follow your approved SOP and current pharmacopoeia.
CFU/100 mL = colonies × 100 / volume filtered (mL)
24 colonies from 50 mL → 48 CFU/100 mL
Count only membranes within the method's countable range; confluent growth needs a smaller volume.