Tetra Easy Crystal Filter Pack C 250 / 300 Carbon

=”Tetra Easy Crystal Filter Pack C 250 / 300 with carbon is a replacement filter cartridge suitable for the Tetra Easy Crystal Filter Box 250 and Tetra Easy Crystal Filter Box 300 (also sold in Tetra Aqua Art and Tetra Starter Line aquariums). For crystal c”&”lear, healthy water, replace every 4 weeks. Contains 3 filter cartridges.