Process for making a powder or granule containing a chelating agent

A process for making a powder (P) or granule (G) comprising

• (a) at least one chelating agent (A) selected from methyl glycine diacetic acid (MGDA), glutamic acid diacetate (GLDA), iminodisuccinic acid (IDS), citric acid and Ethylediamine disuccinic acid (EDDS), their respective alkali metal salts and their mixtures, and (b) optionally, at least one homo- or copolymer (B) of (meth)acrylic acid, partially or fully neutralized with alkali,
• said process comprising the steps of
• (i) mixing the at least one chelating agent (A) and, optionally, the at least one homo- or copolymer (B) in the presence of water,
• (ii) removing most of said water by spray-drying or spray granulation to obtain intermediate powder (IP) or granule (IG), and
• (iii) sprinkling at least one additive (C) in an amount of up to 50% by weight, relative to the complete weight of the resulting powder (P) or granule (G), on the surface of intermediate powder or granule (I), to obtain final powder (P) or granule (G),
• wherein the process is performed in a multizone and/or multinozzle apparatus, wherein step (ii) and sprinkling step (iii) are done in separate zones and/or nozzles of the multizone and/or multinozzle apparatus.