Biological filter foam for ponds, CPF-10000 replacement sponge set with dual density[Excellent Filtration Performance] Our CPF filter foam kit combines dual-density filtration technology with fine yellow and blue layers to effectively capture large debris and fine particles. These filter foams are designed to maintain exceptional water clarity, promoting a thriving aquatic ecosystem. Ideal for use with pond filter media, filter foam pads, and complete filtration systems.[FIT ALL] Our biological pond filter foam is specially designed for CPF series pressure filters, with precise size to fit different pond models and capacities. Whether you're upgrading a small water garden or maintaining a large koi pond, our pond filter foams ensure the best fit and maximum filtration efficiency, helping you achieve clear water all year round. [Easy to Maintain] Simplify your pond maintenance routine with our easy-to-clean and replace filter foam. The dual-layer biofiltration foam captures coarse and fine debris, reducing maintenance frequency while maintaining water health. Ideal for replacing filter foam, pond foam pads, and filter media upgrades to ensure a clean and vibrant aquatic environment. [DURABLE MATERIAL] These pond filter foams are made of high-quality filter foam, which can provide reliable and long-lasting performance all year round. They are designed to withstand temperature fluctuations and humidity conditions and maintain filtration efficiency throughout the seasons. Whatever the weather, trust our pond filtration media to keep your water clear and provide a healthier habitat for your fish.