The SOBO WP-3300A is an advanced internal filter system with integrated air pump designed for aquariums. This compact unit features a dual-layer yellow filter cartridge housed in a transparent chamber, providing efficient water filtration and oxygenation for both fresh and salt water setups. Key features: • Built-in air pump system • Dual-layer filter cartridge • Transparent filter chamber • Easy maintenance design • Suitable for fresh and salt water • Compact and space-saving • Electric powered operation The WP-3300A model comes with a power cord for electrical operation and features a mounting system for easy installation on aquarium walls. The yellow filter cartridge is easily replaceable and visible through the clear housing to monitor when cleaning is needed. The integrated design combines filtration and aeration in one efficient unit, making it ideal for maintaining healthy aquarium environments.