Filtre de charbon pour betta duo/trio / Paquet de 2

This replacement carbon cartridge is designed for Aqua One Betta Duo and Trio filters. It removes water odors and coloration, prevents ammonia and nitrite accumulation, and reduces fish stress. Replace every 2 to 4 weeks for optimal performance.

• The description claims that replacing the cartridge every 2 to 4 weeks ensures optimal performance.