Abstract: A transportable mixer consisting of a double bottomed load body 3 for a change-load vehicle has the space between the bottoms divided into longitudinal compartments and the upper bottom consisting of a screen plate. To each compartment 11, 12, 13 via a switching mechanism 20, there is connected a hose 14, 15, 16, 21, 22 to a pump 23. After water is added, the compartments are subjected with the aid of the switching mechanism to alternating pressure and suction, whereby the material loaded into the body is slurried from below and can be pumped out 24, 25 to the desired location. The screen plate retains coarser contaminants, e.g., stones or sticks. The load body can float and be towed on lakes, but can also be made in the form of a boat with a pump, switching mechanism and its own motor for driving and mixing. The body can be used to make use of old deposits of lime sludge for liming of lakes and soil, for industrial use of fly ash and similar waste materials etc.