LTWHOME Replacement Foam Sets Fit for All Pond Solutions EF-Booster Fish Tank Aquarium External Filter (Pack of 6 Sets) Custom designed and manufactured for

Custom designed and manufactured for the Fluval 404

Size:250*122*41mm

Provides both mechanical and biological filtration

This is not a Sienna OEM product and is not covered under any Sienna manufacturer's warranty

These flat foams that have a slit in them

LTWHOME Replacement Foam Sets Fit for All Pond Solutions EF-Booster Fish Tank Aquarium External Filter (Pack of 6 Sets) Custom designed and manufactured forPack include: Blue Coarse Foam x 6, White Medium Foam x 6, Black Fine Foam x 6. Custom designed and manufactured for EF BOOSTER fish tank filter. Provide efficient water flow with less clogging for long lasting filtration. Safe, washable and reusable.