Once a maximum level is reached in the tank, this innovative overflow siphon, with its skimmer effect, removes particles lighter than water (e.g. flower pollen, oils, etc.) that float slowly to the water surface. Removing this floating layer of surface pollutants through regular overflow from the tank is important in order to maintain high quality water and allowance of oxygen diffusion at the water surface. The coiled baffle in the overflow siphon prevent rodents from entering the tank.

This model is well-suited for PE tanks.