[Excellent Filtration Performance] Our CPF filter foam kit features dual-density filtration technology with fine yellow and blue layers to effectively capture large debris and fine particles. These filter foams help maintain exceptional water clarity, supporting a healthy aquatic environment. Ideal for use with pond filter media, filter foam pads, and complete filtration systems. [FIT ALL] Our biological pond filter foam is designed for CPF series pressure filters, with precise dimensions to fit various pond models and sizes. Whether upgrading a small water garden or maintaining a large koi pond, our filter foams provide a secure fit and optimal filtration efficiency for clear water throughout the year. [Easy to Maintain] Simplify pond maintenance with our easy-to-clean and replace filter foam. The dual-layer biofiltration system captures both coarse and fine debris, reducing cleaning frequency while supporting consistent water quality. Perfect for replacing existing filter foam, foam pads, or upgrading filter media to maintain a clean and vibrant pond ecosystem. [DURABLE MATERIAL] Made from high-quality foam material, these pond filter foams deliver reliable, long-lasting performance. Designed to withstand seasonal temperature changes and varying humidity levels, they maintain filtration effectiveness in all conditions. Count on our filtration media to keep your water clear and support a healthier habitat for fish.