Esctabalt 16 Count Large Filter Cartridges Compatible with Whisper Bio Bag Filters, Large Aquarium Filter Cartridge for Whisper 20i 40i, IQ20/30/45/60, PF20/30/40/60 and Repto FilterBrand: Esctabalt Color: Large 16 Count Features: 100% compatible with Whisper Filter : Our filters are perfectly compatible with Whisper 20i, 40i, IQ20 30 45 60, PF20 30 40 60 and Repto Filter in sizes 7. 1 "X 5. 1" for 20 60 gallon aquariums Triple efficient filtration, clearer water quality : Double layer high density filter effectively captures the residue and fish excrement in the aquarium; Super strong activated carbon quickly remove odors and