ViaAqua 6 Pack X-Large Overflow Filter Box Intake Round Pre-Filter Foam Sponge 5.91" x 4.13" for Aquariums and Ponds (Coarse 25PPI)

*This is for 6 pieces of XL Pre-Filter Foam Sponge (25 PPI)*. The applications of our bio sponge filter are the most versatile. These can be used on the most common air lift bio sponge filter, hang on back type filter, and may be fabricated into a filter you would like. These pre filter sponges are designed for canister filters and Aquaclear 70 and 110 filters. Can also work for Aqueon and other larger hang on back filters as well.

• *This is for 6 pieces of XL Pre-Filter Foam Sponge (25 PPI)*. Ideal for Pond, Aquarium, Freshwater, and Marine environments.
• Intake hole: 1.10 inch (approx.). * Diameter: 4.13 inch (approx.)
• Length: 5.91 inch (approx.). * Inner Length: 4.33 inch (approx.) -- Intake hole is not all the way through.
• Coarseness 25 PPI. These coarse open cells on our bio sponge filter are designed to increase flow rate, trap large particles without harming to small fish, and it prevents premature clogging thus further allows maximum de-nitrification in filter systems.
• These pre filter sponges are designed for canister filters and Aquaclear 70 and 110 filters. Can also work for Aqueon and other larger hang on back filters as well.