Tetra Bio-Bag Filter Cartridges Small For Whisper 3i In Tank Filter (2 Pack)

Whisper Bio-Bag Cartridges are available in ready-to-assemble or assembled replacement cartridges for the Whisper Power Filters. Cartrideges help to keep your aquarium clean and provide easy maintenance. The assembled and disposable single packs are filled with Ultra-Activated carbon that eliminates waste, odors and water discoloration. Single packs are designed to be changed once a month. The ready-to-assemble (RTA) multi-packs are economical and need to be assembled.

Replace the Bio-Bag when the water starts to overflow excessively from the Wonder Tube chamber.