Bag for solid concentrate

A bag made of a flexible wall, the bag having two opposing inner lateral edges, two opposing inner intermediate sections, a lower inner edge, and an upper inner edge, the bag being fitted with an inlet fluid line for introducing dissolution water, and with an outlet fluid line for extracting a solution obtained, wherein

• the lower inner edge is in the overall shape of a V,
• the V has a point, and two arms with each arm having a top,
• the point of the V is further away from the center of the bag than the arms of the V,
• the outlet fluid line opens into the bag as close as possible to the point of the V,
• each arm extends from the point of the V, to a respective one of the opposing inner intermediate sections,
• each inner intermediate section extends from the top of the respective arm to a respective one of the inner lateral edges and comprises a concave shoulder, a constriction nose, an elbow, and a cavity,
• in an empty state of the bag, each concave shoulder starts at the top of the respective arm of the V and gives over to the respective constriction nose,
• in an empty state of the bag, each constriction nose, in a lower part, assumes and continues the concave shape of the respective shoulder and diverges towards the center of the bag as far as the respective elbow,
• each cavity has a rounded shape and extends from the top of the respective arm to the respective elbow, and
• the inner width of the bag narrows between the opposing elbows such that the maximum inner width of the bag between the opposing cavities is greater than the inner width of the bag between the opposing elbows.