The filterability of a sample is determined by means of a pre-coat filtration process conducted at constant pressure. The results of this test can provide a prediction of the filtration characteristics of beer. It is very useful for monitoring measures implemented to improve the filterability of beer. The evaluation is based on the time that is required to obtain a defined volume of filtrate using the filtration apparatus.
Beer
Beer chilled to 0 °C is filtered through kieselguhr at this temperature under constant pressure. The amount of filtrate is recorded periodically (or continuously) during filtration. The amount of filtrate is used to calculate a characteristic number, which can be used to evaluate the filterability of the beer.