Penn Plax Filt-a-Carb Universal Undergravel Cartridge 2-pk

Filt-A–Carb Carbon Undergravel Filter Cartridges are a convenient trouble free filter system with easy maintenance.Undergravel Filter Cartridges are designed to keep your tank looking crystal clear.Filt-A–Carb Carbon Cartridges are made with top quality activated carbon designed to remove harmful gasses and odors, while clearing up unsightly discoloration.Filter Cartridges fit all Undergravel Filters.