6pcs EF-S Filter Cartridge, Compatible EF-S Element/BF5 BETTAFLO, 3.76x1.97 inch | Actual size filter cartridge. Measure before buy. Not for universal tanks. 6 pack for EF-S & BF5 BETTAFLO systems.

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【Check Size Before Purchase】Compatible with EF-S Element and BF5 BETTAFLO filter systems only; actual body size: 3.76 x 1.97 in; overall width with pull tab: 2.44 in; thickness: 0.39 in; measure your old cartridge and filter chamber before ordering
【Multi-Layer Filtration for Clear Water】Made with high-density filter cotton and activated carbon, this aquarium filter cartridge helps trap debris, reduce impurities, and remove unwanted odors, keeping your tank water clean and fresh
【Replace Every 2–4 weeks for Best Results】To maintain optimal filtration performance and water quality, it is recommended to replace the fish tank filter cartridge every 2 to 4 weeks, depending on usage and tank conditions
【Easy Installation & Quick Activation Tip】 Simply rinse the cartridge under cool water for 30 seconds to remove any transit dust, and if the carbon beads have shifted to one side, a gentle shake will quickly redistribute them for uniform filtration ; then, insert it directly into the filter chamber—no tools needed, making it perfect even for beginners.
【Durable & Fish-Safe Materials】 Each EF-S aquarium filter cartridge is made from durable, fish-safe materials, providing reliable filtration while supporting a healthy aquatic environment for betta fish and other small species.