Fluval Foam captures large particles and debris for effective mechanical filtration, which is the crucial first stage in the filtration process. Custom fit to prevent debris bypass, the foam has a pore size that allows efficient water flow with less clogging for long-lasting filtration. The foam also enhances biological filtration. All have 2 pieces except FX4/FX5/FX6 foam has 3 pieces.

• Mechanical filter media
• Effectively traps majority of waste and debris
• Complex foam structure maintains consistent water flow and naturally promotes beneficial bacteria growth
• Custom fit to prevent debris bypass
• Enhances the biological filtration process
• Replace every 6 months
• For use in freshwater and saltwater aquariums