A fluid treatment system having bulk beds. The fluid to be treated essentially streams from the bottom up through a bulk bed, while the bulk material migrates through the bulk beds in countercurrent to the fluid essentially from the top down. This is accomplished by removing partial quantities of bulk material at the lower end of the bulk bed, and delivering partial quantities of the bulk material to the bulk bed at the top. At least one charging wagon provided with optionally sealable bulk material outlets is able to traverse a charging channel between a charging position and several partial bulk bed release positions above the bulk beds. Provided below the bulk material outlets and the bulk material valve of the charging wagon are bulk material through pipes, the bulk material outlet mouths of which end on bulk material cones of an underlying bulk bed.