Aqueon Filter Cartridge Large 6 Pack Do not clean Bioholster when

Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria

and even multi-colored variations

Fresh vegetables

Whether you're a first-time bird owner or an experienced one

which avoids disrupting the nitrogen cycle and is essential for maintaining clean and healthy water

Aqueon Filter Cartridge Large 6 Pack Do not clean Bioholster whenAqueon Replacement Filter Cartridges are dual sided, featuring dense floss with over 25% more activated carbon than the leading brands. These patented cartridges were designed to ensure even distribution of activated carbon. To use, simply rinse under cold water and easily install using the "FRONT" orientation tab. Aqueon Replacement Cartridges are available in: X Small, Small, Medium and Large. Replace cartridges every 4 weeks for optimal performance.