Water spraying is used to reduce dustiness and achieve optimum moisture content of the mixed substrates. The spray nozzles are connected to a local process water source. The spray rate is adjusted and controlled by a flow meter and the rate is determined by the recipe. Spraying is carried out in automatic mode. The water is piped to special nozzles, and these create a fine mist to facilitate the application of the liquid on the substrate.

The liquid fertilizer nozzle works on the same principle as the water sprayer, but the liquid fertilizer is pumped from the storage tank where the concentrate is diluted with process water and continuously mixed.