Perfect-A-Flo Carbon Filter Cartridges

Replacement carbon filter cartridges for Perfecto Perfect-A-Flo and Undertow Undergravel filters. High quality activated carbon removes gases, odors, and discoloration from aquarium water. Also fits all Perfecto Seamless Aquariums (2-1/2 hex, 5-hex, 4-rectangular, and 5-octagon.) Two refillable cartridges per package. Approximately 1-1/4" x 1-1/2" x 1-1/4".