A bearing with axial variations may include two or more different zones along its axial length either on the surface of a bore formed in the main body of the bearing with axial variations or on the outside diameter thereof. The process comprising the steps of forming a ceramic slurry comprising hydrated alumina, selected from bauxite and aluminum hydroxide, and ammonia stabilized colloidal silica. A thermodynamic model is applied to the accessed parameters, and a predictive cost reduction associated with an improvement of the process based on applying the thermodynamic model is output. Further, the system for metabolization comprises at least one planting opening provided on the housing between the inlet opening and the outlet opening for the accommodation of a support element for plants, the planting opening being in communication with the elongated space, and a porous filler material provided in the elongated space.