Abstract: A solid concentrated agrochemical composition comprising a homogeneous mixture of: (1) one (or a number of) concentrated compositions A in the form of dispersible granules, each granule containing at least one active material and not containing an effervescent agent, and having a cumulative pore volume of between 0.17 and 0.35 ml/g and having an apparent density of between 0.35 and 0.8 g/cm3; and (2) a concentrated composition B in the form of dispersible granules, each granule containing an effervescent agent and not containing an active material, and having a cumulative pore volume of between 0.020 and 0.13 ml/g and having an apparent density of between 0.8 and 1.5 g/cm3; the A/B quantitative ratio being between 0.01 and 30. A containerization system comprising said agrochemical composition within a bag whose wall is a film consisting of a film-forming material which is soluble or dispersible in water.