Switior Tetra Whisper 3i Internal Filter Cartridges (16 Pack)

16-pack cartridges deliver economical replacements for ongoing filter maintenance and reduce frequent re-purchasing.

Explicitly compatible with Tetra Whisper 3i internal filters, enabling plug-and-play replacement without tools.

Filtration media stack includes high-density cotton, activated carbon, and zeolite to target debris, odors, and metals.

Reinforced cross-baffle design increases direct contact between water and media for improved purification.

Dense dual-layer mesh helps capture debris and fish waste, helping maintain clearer aquarium water.

Simple installation: remove the old cartridge and install the new one; rinse before first use to remove transport dust.

Clear replacement guidance: commonly recommended every 2–3 weeks depending on bio-load and flow.

Value-focused option that balances cost with filtration performance for budget-conscious aquarists.

Size compatibility can vary; some units or variants may be too wide for certain 3i housings.

Not guaranteed to match every image or listing; occasional fitment mismatches have led to returns.

Some batches may require careful inspection for fit to avoid gaps that could reduce filtration efficiency.

Frequent replacement cadence may increase ongoing maintenance costs for high-bioload tanks.