Membrane filtration is a simple way of concentrating any microorganisms present in a non-turbid, liquid water sample.
Quantitative enrichment of large, filterable volumes on wort agar plates.
Membrane filters with pore sizes of 0.65 µm retain yeasts from the liquid sample, which are then incubated aerobically on agar nutrient media. The filtrate is collected in a receiver vessel and then discarded. After incubation, the yeast is analysed under a microscope.