Micro internal filter for terrariums and paludariumswith shallow water area or water bowls (e.g. for frogs, semiaquaticreptiles, cray fish etc.) under 9 gallons. This unique little flat water filter is designed differently toan internal aquarium filter: It doesn't hang on to anything, but rather lies horizontally in the water. It is fixed with suctioncups to the bottom of the tank. Here it draws the water in frombelow, pumps it through the filter sponge and directs it outfiltered at the top. The surface water movement makes the drinkingwater for reptiles visible. If you want to adjust the outflowdirection, you can attach an outflow hose.