Cloudy beers
The shelf-life test involves direct incubation of the untreated, sealed sample with accompanying visual inspection of the biological states of a beverage (slime formation, creamy skin, agglomerates) and a final microscopic analysis.
Filtered beer
Testing for microbiological shelf life involves direct incubation of the untreated sealed sample as well as a visual inspection of the biological condition of a beverage (medium) and a final microscopic analysis in the event of positive visual findings.