The Exo Terra Repti Clear Carbon Cartridge is designed to fit the Exo Terra Repti Clear F250 and F350 Filters, and helps improve the water clarity in your terrarium or aquarium. The Exo Terra Repti Clear Carbon Cartridge provides superior adsorption qualities which eliminate odours, discoloration and impurities. Designed to fit the Exo Terra Repti Clear F250 / F350 Absorbs odours and helps with water discoloration Aids in removing water impurities and improves water clarity Easy to use and replace Available Size: 2 x Carbon Cartridges for Repti Clear F250 & F350 Terrarium Filter