[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. Suitable 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 maintaining a small water garden or a large koi pond, our filter foams provide a secure fit and optimal filtration performance for clear water throughout the year. [Easy to Maintain] Simplify pond care with our easy-to-clean and replace filter foam. The dual-layer biofiltration design captures both coarse and fine debris, reducing cleaning frequency while supporting water quality. Ideal for replacing pond foam pads and upgrading filter media to maintain a clean and vibrant pond ecosystem. [DURABLE MATERIAL] Made from high-quality filter foam, these foams deliver reliable, long-lasting performance. Built to endure seasonal temperature changes and moisture exposure, they maintain filtration efficiency year-round. Count on our pond filtration media to keep water clear and support a healthy habitat for fish.