Fluval U2 Underwater Filter with three-stage filtration is ideal for use in fresh, marine or reptile environments. Stage 1 foam removes large particles. In stage 2, the poly/carbon cartridge traps fine debris, improves water clarity and removes impurities. In stage 3, BioMax provides optimal biological filtration efficiency.

• Filters debris and provides optimal biological filtration
• Simple to install and maintain
• Silent and efficient
• Ideal supplemental or stand-alone filter, or for installations where external filtration is not possible
• Comes with 3-way flow control with adjustable output, 2 foam pads, 2 poly/carbon cartridges and 40 grams BioMax; Ideal for 12-30 gallon environments