Aqueon QuietFlow LED Pro Power Filter, Size 10, up to 20 Gallon

LED indicator light flashes when water cannot pass through the cartridge, generally indicating it's time to change the cartridge
Self-priming filter pump will auto-start initially or restart if power is interrupted and restored
Provides mechanical, chemical, biological and optional, additional specialty pad filtration
High flow rates for optimal dissolved oxygen content to promote healthier, more active fish
Internal pump design helps dampen noise and eliminate leaks with self-priming feature
Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria
Fits fresh or saltwater aquarium size up to 20 gallons
Uses One Medium Aqueon Replacement Cartridge and Size 10 Specialty Filter Pads