Tetra Whisper Bio-Bag Medium Aquarium Filter Cartridges, 12 Pack with Dual-Sided Mesh

Tetra Whisper Bio-Bag Medium Filter Cartridges are disposable replacements for compatible Tetra aquarium filters, designed to keep water clear with dense, dual-sided mesh and Ultra-Activated carbon.

• Dense, dual-sided mesh catches debris and fish waste — helps filter particles from aquarium water.
• Ultra-Activated carbon absorbs odors — helps remove odor and discoloration.
• Medium size fits several Tetra Whisper filters — match the cartridge to a compatible model.
• Assembled and ready to use — no cartridge assembly is needed.
• 3 Ct (12 Pack) — a multipack of medium replacement cartridges.

For a healthy-looking aquarium, filter cartridges need to collect waste while helping manage odors and discolored water. These disposable replacements are made for routine filter maintenance in compatible Tetra systems, with color-coded packaging to make it easier to identify the size when choosing a replacement.

How does the Tetra Whisper Bio-Bag filter aquarium water?

The cartridge uses mesh to catch physical debris and fish waste, while its carbon absorbs odors and helps remove discoloration. Together, these filtration functions are designed to keep aquarium water clear.

• The mesh is dual-sided, providing a filtering surface on both sides.
• The cartridge is disposable and intended as a replacement filter.

Which Tetra filters fit the medium Bio-Bag cartridge?

The medium cartridge fits the Tetra Whisper PF10 Power Filter, Tetra Whisper 10i Internal Filter, and Tetra Reptofilter 90 GPH. Choose the medium size for these models; Tetra’s Bio-Bag sizes are color-coded to help identify the replacement size.

• Compatible models: Whisper PF10 Power Filter, 10i Internal Filter, and Reptofilter 90 GPH.
• Small Bio-Bag cartridges fit the Whisper 3i Internal Filter.
• Large Bio-Bag cartridges fit Whisper 20, 30, 40, and 60 Power Filters and 20i and 40i Internal Filters.

How do you install and replace a Bio-Bag cartridge?

Rinse the cartridge under cool tap water to remove carbon dust, open the filter lid, and insert the Bio-Bag. Change it monthly for best results, or sooner if needed; reduced water flow from the filter is a sign that a cartridge is clogged and should be replaced.

• Rinse before installation to clear away carbon dust.
• Replace sooner than the monthly schedule if water flow is reduced.

This multipack suits aquarium keepers using a compatible medium-size Tetra filter who want a ready-to-install disposable cartridge for regular maintenance. Tetra has developed fish food knowledge since 1951, alongside products and solutions for fishkeeping enthusiasts. The medium Bio-Bag combines mesh filtration and carbon in a replacement cartridge for the specified Tetra filter models.