Aquarium Pharmaceuticals Filstar Chemical Rings (1 Liter) are super-high porosity rings have greater surface area than conventional ceramic filter media, giving beneficial bacteria more room and chance to grow and enhance the aquarium's biological filter. Ceramic Rings are specially designed for use in all FilStar filters.
- Durable ceramic rings require no cleaning or maintenance
- Porous ceramic rings provide maximum surface area for beneficial bacteria
- Place Ceramic Rings in the top compartment tray in the FilStar canister filter