High-quality production of beer requires professional yeast management, even on a small scale. The MICRO PROP system by Esau & Hueber provides small breweries with an in-house supply of strongly fermenting, high-vitality yeast. The removable quantity can be adapted to the production requirements by adjusting the propagation time, temperature, aeration volume / aeration intervals for the start cells and the residual cells in the propagator. Intense aeration ensures optimum yeast growth. The construction strictly follows the specifications for hygienic design and ensures biological safety, so that the brewery always has a reliable supply of fresh propagation yeast. The system is suitable for small breweries as well as for larger breweries to handle the transfer from yeast propagation in a laboratory to industrial-scale propagation.