and Overview: The Aqueon® QuietFlow® PRO Aquarium Power Filters are designed to deliver strong, reliable filtration to keep your aquarium water clean, clear, and healthy. Now upgraded with a no–drip floss cartridge, maintenance is cleaner and more convenient than ever. There are five total stages of filtration: mechanical, chemical, biological and an additional specialty pad. Stage 1 - Dense floss removes particles and debris. Stage 2 - Activated carbon removes toxins, odors and discoloration. Stage 3 - Patented Bio–Holster provides surface area for beneficial bacteria that remove toxic ammonia and nitrites. Stage 4 - Bio–Media grid supports additional beneficial bacteria establishment while adding more oxygen. It also reduces splashing making the return exceptionally quiet. Stage 5 - Specialty filter pad option for additional carbon, ammonia reducer or phosphate remover. The internal pump is self–priming, which means it will automatically restart after cleaning or power interruptions, and it's designed to run quietly while minimizing leaks. With high flow rates to improve oxygen levels, this filter supports a more active and vibrant aquatic environment. Features & Benefits: Five stages of filtration provide thorough mechanical, chemical, biological, and optional specialty filtration. The self–priming pump automatically restarts after cleaning or power loss, so there's no manual priming needed. The internal pump design helps reduce noise and eliminates leaks for a quieter, more reliable experience. High flow rates promote better oxygenation, helping keep fish healthier and more active. Includes a NoDrip floss cartridge to help prevent spills when changing filters. Compatible with both freshwater and saltwater aquariums. Intended Pet(s): Fish Includes: Filter, 1 Cartridge Intended Pet(s): Fish Color: Black Advice for Use: All filters use Aqueon PRO Replacement Filter Cartridges and Aqueon Specialty Filter Pads. Change filter cartridge every 4 weeks for best results. Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria. Fits fresh or saltwater aquarium size up to 50 gallons. Aqueon QuietFlow PRO Aquarium Tank Power Filter, Size: up to 50 gal | PetSmart