Feature:1. 1. Fish stool suction collector is a 3-in-1 pump used as a filter, oxygenation and fecal collector to keep the aquarium clean.2. 2. The system operates on a pneumatic principle, treats the water in the water tank, and stores fish manure and impurities in the middle compartment before returning the clean water to the water tank.3. 3. The fish poop suction device will reduce the need for regular water changes and gravel washing. Contains fish waste to prevent water pollution and bad odor.4. 4. Just place it in the aquarium and connect it to the air pump. When the compartment is full of fish waste, please clean up before putting it back into the aquarium.5. 5. At the bottom of the cylinder, there is a biological filter ball, which is essential for the nitrogen cycle.Specification:Material: ABSColor: GrayDimensions: 16 x 9 x 9 cm (6.3X3.54X3.54 inches)Application: both fresh water and seawater, suitable for fish tanks within 80-100cm.Package List:1xFish Stool Suction Collecto Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.