Fish Stool Suction Collector Fish Stool Type Vacuum Cleaner Fully Automatic Material : Acrylic ; Color: gray ; Size:16 x 9 x 9 cm (6.3X3.54X3.54inch) The system operates on the pneumatic principle, treating water in the tank and storing fish waste and impurities in the middle compartment before returning clean water to the tank. The Fish Stool Suction Collector is a three-in-one pump that acts as a filtration, oxygenation, and to keep your aquarium clean. The need for regular water changes and gravel washing will be reduced with Fish Stool Suction Collector. Simply place the unit inside the aquarium tank and connect it to an air pump. When the collector is full of fish waste, empty and until it has been cleaned before returning it back to the aquarium tank. Specification: Material :Acrylic Color: gray Size:16 x 9 x 9 cm (6.3X3.54X3.54inch) Package Included: 1 x Fully Automatic Notice: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow some differences due to manual measurement. Thank you for your kindly understanding