Cunina EF-S Aquarium Filter Cartridges, 12-Pack for Top Fin BF5 with Four-Layer Media

Cunina EF-S filter cartridges are a 12-pack of replacement filters for compatible Top Fin EF-S and BF5 systems, with a four-layer media structure for aquarium water filtration.

• Fits compatible Top Fin EF-S and BF5 filters — a replacement option for these filter systems.
• Each cartridge measures 2 × 3.8 inches (5.08 × 9.652 cm) — compare the size with your filter chamber.
• Four-layer media includes dual-sided mesh, activated carbon and zeolite — combines multiple filtration materials in each cartridge.
• Activated carbon removes odors and toxins, while zeolite absorbs ammonia and heavy metals — supports aquarium water care.
• 12 cartridges per pack — provides replacements for routine filter maintenance.

Small aquariums, including betta and shrimp setups, need compatible filter media that fits the filter chamber and can be replaced as part of regular tank care. These cartridges are made for Top Fin EF-S and BF5 filters, with the size and media details to help you identify the fit and filtration approach before choosing them.

Will these cartridges fit my aquarium filter?

Cunina EF-S cartridges are compatible with Top Fin EF-S and BF5 filter systems. Each cartridge measures 2 × 3.8 inches (5.08 × 9.652 cm), so compare those dimensions with the cartridge space in your filter before use. They are intended for the compatible systems named here, including BF5 BETTAFLO setups.

• Replacement cartridges for compatible EF-S and BF5 filters.
• Designed for use in small aquarium filtration setups.

What filtration media is in each cartridge?

Each Cunina cartridge uses a four-layer media structure with dual-sided mesh, activated carbon and zeolite. The mesh forms part of the layered filter material, while activated carbon removes odors and toxins. Zeolite absorbs ammonia and heavy metals, giving the cartridge distinct media for these water-care functions.

• Dual-sided mesh is included in the layered construction.
• Activated carbon and zeolite provide different filtration functions.

How do I install and replace a cartridge?

Rinse a new Cunina cartridge under cool water, then place it in the filter chamber; no tools are needed. The cartridges arrive vacuum packed, so loosen the media before use. For routine maintenance, replacement is recommended every 2–4 weeks to help maintain water quality.

• Rinse under cool water before placing it in the chamber.
• Loosen the cartridge after removing it from its vacuum-packed state.
• Plan routine replacement at the recommended 2–4 week interval.

Cunina EF-S cartridges suit aquarium keepers maintaining compatible Top Fin EF-S or BF5 filters, especially in betta and shrimp setups. The 12-cartridge pack, defined fit and layered media make them a practical choice for regular filter replacement in those systems.

Read our guide: Aquascaping a freshwater tank: substrate, stone, wood and light