Penn-Plax Filt-A-Carb for Multi-Pore and Undergravel E Filters - 2 Pack

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 Undertow “E” Filters.