Counter-flow filtration device, particularly for the treatment and/or purification of water for the adsorptive removal of inorganic or organic based contaminants and, in particular, continuous receiving, storing and delivery at least a preferably particulate adsorption material, - wherein the counter-flow filtration device comprises at least a housing, wherein the housing comprises at least one adsorption and/or counter-flow zone as well as at least one water inlet region and at least one water outlet region, - wherein the adsorption and/or counter-flow zone is arranged fluidically between the water inlet region and the water outlet region and/or the adsorption and/or counter-flowzone is arranged downstream of the water inlet region and upstream of the water outlet region relative to the direction of flow of the water, - wherein the water inlet region comprises at least one water inlet and at least one adsorption material outlet and wherein the water outlet region comprises at least one water outlet and at least one adsorption material inlet, - wherein the ratio of the diameter of the adsorption and/or counter-flowzone to the diameter of the water inlet region [ratio of diameter: diameter] is at least 1: 1.1, and - wherein the ratio of the diameter of the adsorption and/or counter-flowzone to the diameter of the water outlet region [ratio of diameter: diameter] is at least 1: 1.1, and - wherein the counter-flow filtration device comprises a first transition region and a second transition region, - wherein the first transition region is arranged fluidically between the water inlet region and the adsorption and/or counter-flow zone and/or wherein the first transition region is arranged downstream of the water inlet region and upstream of the adsorption and/or counter-flow zone, relative to the direction of flow of the water, - wherein the first transition region, starting from the water inlet region with the diameter, is tapered to the diameter in the direction of the adsorption and/or counter-flow zone, and - wherein the second transition region is arranged fluidically between the water-outlet region and the adsorption and/or counter-flow zone and/or wherein the second transition region is arranged downstream of the adsorption and/or counter-flow zone and upstream of the water outlet region with respect to the direction of flow of the water, - wherein the second transition region, starting from the water outlet region with the diameter is tapered to the diameter in the direction of the adsorption and/or counter-flow zone. - wherein the counter-flow filtration device comprises at least a housing, wherein the housing comprises at least one adsorption and/or counter-flow zone as well as at least one water inlet region and at least one water outlet region, - wherein the adsorption and/or counter-flow zone is arranged fluidically between the water inlet region and the water outlet region and/or the adsorption and/or counter-flowzone is arranged downstream of the water inlet region and upstream of the water outlet region relative to the direction of flow of the water, - wherein the water inlet region comprises at least one water inlet and at least one adsorption material outlet and wherein the water outlet region comprises at least one water outlet and at least one adsorption material inlet, - wherein the ratio of the diameter of the adsorption and/or counter-flowzone to the diameter of the water inlet region [ratio of diameter: diameter] is at least 1: 1.1, and - wherein the ratio of the diameter of the adsorption and/or counter-flowzone to the diameter of the water outlet region [ratio of diameter: diameter] is at least 1: 1.1, and - wherein the counter-flow filtration device comprises a first transition region and a second transition region, - wherein the first transition region is arranged fluidically between the water inlet region and the adsorption and/or counter-flow zone and/or wherein the first transition region is arranged downstream of the water inlet region and upstream of the adsorption and/or counter-flow zone, relative to the direction of flow of the water, - wherein the first transition region, starting from the water inlet region with the diameter, is tapered to the diameter in the direction of the adsorption and/or counter-flow zone, and - wherein the second transition region is arranged fluidically between the water-outlet region and the adsorption and/or counter-flow zone and/or wherein the second transition region is arranged downstream of the adsorption and/or counter-flow zone and upstream of the water outlet region with respect to the direction of flow of the water, - wherein the second transition region, starting from the water outlet region with the diameter is tapered to the diameter in the direction of the adsorption and/or counter-flow zone.