Abstract: A tank for containing granular adsorbers for cleaning gases, wherein the tank has a gas inlet, a gas distributing chamber, at least one adsorption chamber defined by vertical, gas-permeable walls and containing a charge of adsorbers in bulk, an outflow chamber and a gas outlet. Each gas-permeable wall consists of horizontal rails of plastic arranged at a distance above one another, through which pass vertical centering rods of plastic. At least half of the rails have the cross-sectional profile of an inverted U. In the tank at least one vertical supporting wall is arranged, which divides the adsorption chamber. At least the surface of the supporting wall consists of plastic.