ShuRex 12 Pack Replacement Filter Cartridges XS for Tetra Whisper Extra Small & 3-Gallon Aquarium Kits

Compact filtration for small tanks

ShuRex XS replacement cartridges are designed for Whisper Extra Small filters and other compact systems in aquariums up to 3 gallons. With a slim 2.2" x 2.2" footprint, they slide into place in many hobbyist setups, helping you maintain a clean, clear view of your aquatic display. Whether you’re upgrading a betta tank, nano setup, or small community tank, these cartridges are built to fit tightly and perform consistently, so you can enjoy the scenery without fuss.

Three-layer filtration that works

The cartridge uses a three-layer approach: a double-layer microfiber layer to trap debris and fish waste, plus an inner activated carbon core to reduce odors and discoloration. This combination can support a crisper water appearance and a more inviting viewing experience in day-to-day conditions.

• Three-layer design with double-layer microfiber for debris and waste capture
• Inner activated carbon helps manage odors and discoloration
• Supports clearer water and enhanced tank presentation

Simple maintenance and long-term value

Replacement is straightforward and often requires no messy wet hands. If you notice reduced water flow, a quick cartridge swap is a sensible maintenance step. This 12-pack offers a cost-effective, year-long supply for compatible small filters.

• Easy to install with minimal mess
• Replace every 3–4 weeks if flow slows to maintain efficiency
• 12-pack provides a convenient, affordable year-long refill option

Note: Please check compatibility with your specific model before purchasing to ensure a proper fit.