Review on 🐠 Aquarium Filtration with Tetra Whisper Bio-Bag Filter Cartridges by Christina Waltemeyer

. I can use each cartridge for about 5 weeks before needing to be replaced. The cartridge fits my Tetra 19550 Whisper Aquarium Filter which I have installed in a 3 gallon aquarium. The filter cartridge keeps the water clean and absorbs all bad odors from the aquarium. The black plastic must face the water so the dirty water will flow first through the plastic side, then through the charcoal, then through the cloth and finally through the aquarium. In other words, carbon can be pushed into the aquarium.