Abstract: A mixer unit comprising a mixing chamber comprising a de-agglomerator with a de-agglomeration shaft with de-agglomeration means, a mixer with a mixer shaft with two or more mixing paddles, arranged for mixing and impelling particles and powders in an upstream direction towards the de-agglomerator wherein said de-agglomeration shaft is arranged above, and in parallel with said mixer shaft, so that all particles will be impelled towards the de-agglomerator, each time particles are lifted. Further said mixing chamber comprising a first portion of said mixing chamber having an inner profile adjacent and curved about an upper part of said de-agglomerator and arranged to guide particles and powders impelled by said mixing paddles over said de-agglomeration shaft and into a liquid spray.