Feature: 1. Made of high‑quality plastic and filter sponge, the ultra‑quiet design provides a good live environment for fish without disturb them. 2. The two sponges have a dual function to establish a biological filter, provide a larger area and speed up the circulation speed and maintain the cleaning effect during the filtration process. 3. It is easy to install, first soak the filter cotton with fish tank water, then connect the air hose to the small nozzle, and then turn on the air pump to provide fish filtering function. 4. Equipped with 2 suction cups, it can be installed in any position on the fish tank glass, the simple and elegant design does not affect the beauty of the tank. 5. This product needs to be connected to an air pump to generate a lot of bubbles and increase the oxygen content of the water in fish tank. Specification: Condition: 100% Brand NewItem Type: Sponge FilterMaterial: Plastic+SpongeColor: As Picture ShownQS-100A S with Container: Suitable for fish tanks below 60cm/23.6inContainer: 2PcsContainer Capacity: 100MLQS-200A L with Container: Suitable for fish tanks above 60cm/23.6inContainer: 2PcsContainer Capacity: 200ML Telescopic Tube Length: Approx. 195-275mm/7.7-10.8inSuitable Type: Freshwater fish tank, shrimp tank, etc. Product Function: 1. This product needs to be connected to an air pump 2. Connecting to the air pump can generate a lot of bubbles and increase the oxygen content of the water body 3. Filter sponge provides a large area, cultivates dense nitrifying bacteria, and plays a role of biochemical filtration. Package List: 1 x Sponge Filter2 x Suction Cup2 x Container Note: 1. When disassembling the container and the black lid, use the method of breaking apart instead of pulling it straight2. Do not place container at an angle to prevent the filter from sliding into the water inlet and blocking the water inflow3. During installation, disassembly and use, do not let the filter material enter the water inlet of the black upper cover