Fluval U4 Internal Filter Offering outstanding 3-stage filtration, increased water movement and vital aeration, Fluval U-Series internal filters are the perfect solution where external filtration is not possible. Now with new and improved design...

Fluval U4 Refresh Kit 3pk/5pc (includes BioMax, Carbon & Pad) This kit includes all 3 medias required for U4 canister filter. Includes Polishing Foam Insert, BioMax, Carbon Low Maintenance Genuine Fluval spare part We recommend only using Fluval...

Fluval U4 Compatible Polyester Pad (6pk) The polyester filter pad side filters out fine debris and contaminants. For freshwater, marine or reptile environments. For crystal clear water Replace every 6-8 weeks Easy to replace Works in freshwater, marine...

Fluval U4 Compatible Foam Pad (6pk) Foam Pads capture large particles and debris for effective mechanical filtration, the crucial first stage in the filtration process.  The foam pad has a pore size that allows efficient water flow, less clogging...

Fluval U4 Internal Filter Bracket 1 per pack Easy to replace Genuine Fluval spare part We recommend using only genuine Fluval spare parts in their filters

Fluval U Series - Suction Cups  Easy to Replace Replace as needed We recommend using only genuine Fluval spare parts in their filters

Fluval U Series - Clean & Clear Cartridge The Fluval Clean & Clear Cartridge is packed with special high performance resins, proven to reduce phosphate and nitrate for a cleaner, clearer aquarium and healthier fish. Suitable for all U-Series...

Fluval U4 Compatible Carbon Foam Pad (6pk) Custom-sized, It effectively filters out extremely fine suspended particles and contaminants. Suitable for freshwater, marine or reptile environments. Remove waste particles Helps bological filtration Easy...

Fluval U4 Internal Filter Impeller Shaft 1 per pack Easy to replace Genuine Fluval spare part We recommend using only genuine Fluval spare parts in their filters

Fluval U4 Internal Filter Impeller Assembly 1 per pack Easy to replace Genuine Fluval spare part We recommend using only genuine Fluval spare parts in their filters

Fluval U BioMax 110gm For Fluval® U Series Underwater Filter models U2, U3, U4 Fluval® BIOMAX provides an optimal environment for the colonization and growth of beneficial bacteria. The unique bio rings have a complex pore system that provides an...

Fluval U4 - Poly/Carbon Cartridge (2pk) The Fluval® Poly/Carbon Cartridge has two sides that combine to provide thorough and effective chemical filtration, the crucial second stage in the filtration process. The polyester filter pad side filters out...

Fluval U4 - Internal Filter Motor Unit 1 per pack Easy to replace Genuine Fluval spare part We recommend using only genuine Fluval spare parts in their filters

Fluval U4 - Foam Insert The Fluval® Foam Pad captures large particles and debris for effective mechanical filtration, the crucial first stage in the filtration process. Custom-sized, it fits perfectly inside the filter chamber to prevent debris...