Fluval Underwater Filter - U4

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Fluval "U4" underwater filter with three stage filtration are ideal for use in fresh, marine or reptile environments. Stage 1 foam removes large particles. Stage 2 poly/carbon cart ridge traps fine debris, improves water clarity and removes impurities. Stage 3 BIOMAX provides optimal biological filtration efficiency. Fluval U4 underwater filter offers a Flip-Top for quick and easy maintenance and an adjustable 3 way flow for output flexibility. Suitable for aquariums from 34-65 US gal. (130-240 L). Show more