Abstract: One or more vertically oriented cyclones are arranged for treating polluted water by oxygenizing the water and separating polluting particles contained therein. Each cyclone has a conically tapered open-ended elongated chamber having a top and a bottom. The top is exposed to the air and the bottom is submerged below the surface of the water being treated. The cyclone draws water in through a tangential inlet adjacent the bottom end of the cyclone. Upon entering the cyclone the water to be treated is rotationally moved in a spiral upward along the inside surface of the cyclone. A portion of the water being treated exits the top of the cyclone carrying separated polluting particles, while the majority of the water being treated exits the bottom of the cyclone with air entrapped therein.

Abstract: A water dam includes a number of loading pallets arranged side-by-side and inclined outward from the water supported by supports. Membranes are placed on loading pallets and extend a distance in front of the pallets under the water. The membranes may be held down in the front edge by stones, sand bags, etc. initially to hold the membrane in place. The supports are triangular and made of U-shaped sheet metal beams. The one on which the pallets rest grips over the adjoining legs of two loading pallets to hold these together. To the rear the support is extended sufficient to secure that it cannot be tilted by the water. To achieve this and achieve a good grip on the ground the inclination is preferably 45.degree., resulting in great vertical forces on the ground, a good grip on the ground.