Aqua One Carbon Cartridge for Betta Duo/Trio – 2 pk

This Replacement Carbon Cartridge has been specifically tailored to fit the Aqua One Betta Duo or Trio. It removes odors and discoloration from the water, and prevents the build up of toxic ammonia and nitrite, reducing stress on fish. For the most effective results from this filter cartridge, replace it every 2-4 weeks.