Fluval U4 Underwater Filter 4.6" length x 5.2" width x 14" heigh

The Fluval U4 Underwater Filter with three stage filtration is ideal for use in fresh, marine or reptile environments. The Fluval U4 Underwater Filter has stage 1 foam which removes large particles. The stage 2, the poly/carbon cartridge traps fine debris, improves water clarity and removes impurities. The final stage, stage 3, has BioMax which provides optimal biological filtration efficiency. The Fluval U4 Underwater Filter also has a flip top for quick and easy maintenance. The Fluval U4 Underwater Filter was specifically designed for use in your Fluval U4 Underwater Filter.