Fish & Aquatic Pets
Tetra Whisper Bio-Bag with Stay Clean, Large Filter Cartridges for Aquariums, 12 Count, Unassembled, Fits Tetra Whisper Fish Tank Filters 10-30 Gal, 20-40 Gal, PF-20, 30, 40, 60, IQ 20, 30, 45, 60
The Tetra Whisper Bio-Bag with Stay Clean is a large, 12-count aquarium filter cartridge pack made for several Tetra Whisper in-tank and external filters. I like the water-clarity performance and easy maintenance, but the packaging and charcoal dust issues are real.