The application of chemical disinfectants is done with stationary or mobile spraying devices. In medium or small scale meat plants, mobile spraying devices are sufficient (Fig. 493). The disinfectant is applied by means of spraying lances and manual or electrical pumps. One important rule is, that the disinfectant solution must be applied from top to bottom, i.e., first upper parts of walls, then lower parts of walls and the floor last. The same applies to equipment.