Fluid bed bottom Spray Coating called Wurster fluid-bed process is a technology for precision application of high quality reproducible films onto particulate materials such as powders, crystals, or granules. In bottom spray coating for wurster coating spraying is done from below upwards. The spray nozzles are integrated in the flow bed and thus completely swathe by the product. By combining flow bed and partition, a targeted and controlled movement of the particles can be achieved. This is the requirement for the optimal application of the coating materials to the particles.