![[Pack of 4] - Fluval Underwater Filter Stage 2 Polyester/Carbon Cartridges U3 Filter Cartridge (2 Pack)](http://cdn.shopify.com/s/files/1/0013/0410/0927/products/45320_{width}x.jpg?v=1605593484)
[Pack of 4] - Fluval Underwater Filter Stage 2 Polyester/Carbon Cartridges U3 Filter Cartridge (2 Pack)

- Stage 2 Poly / Carbon replacement cartridge
- Improves water clarity, traps debris and removes odor from aquarium water
- Dual sided cartridges provide more effective filtration

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