Efficient Filtration Technology: Our CPF pond filter sponge set has two types of specialized sponges. Blue Coarse Sponges: Designed for large particle filtration, the blue sponge uses large pores to isolate and filter large impurities. It also promotes the activity of nitrifying bacteria for efficient decomposition. Yellow Fine Sponges: Designed for small particle filtration, the yellow sponge uses small pores to isolate and filter fine impurities. [Customized Compatibility] - Exclusively designed for the CPF series, these filter sponge sets ensure perfect compatibility and optimal performance. CPF1500 to CPF5000: Ideal for small ponds. CPF10000 to CPF15000: Perfect for medium-sized ponds, providing a tailored solution with a specific amount of filter sponges. CPF20000 to CPF50000: Designed for large ponds, providing complete filtration with a specific number of sponges for effective trapping of both small and large particles. Easy Maintenance: Simplify your pond maintenance routine with our easy-to-clean and replace biological filter sponges. The blue and yellow sponges ensure effective trapping of both small and large impurities, promoting a pristine pond environment. [Year-Round Reliability] Built to withstand various weather conditions, CPF pond filter sponge sets provide consistent performance throughout the seasons. Trust their reliability, whether its scorching summers or freezing winters. Complete Pond Maintenance Solution: Say goodbye to cloudy water and embrace a pristine pond. Tailored to the size of your pond, each model offers a complete solution to maintain water clarity and a thriving aquatic ecosystem. [Versatile Customization] Designed for ponds of varying sizes, each model comes with a customized sponge set to meet the specific needs of your pond. With multiple options for CPF pond models, customize your filtration solution to meet the specific needs of your pond. Choose the perfect fit for your unique needs Premium Filtration Material: Made from premium filtration foam, these sponge sets offer superior durability and filtration efficiency. Invest in the longevity of your ponds filtration system with our high-quality material. Custom designed to fit your specific CPF model, they improve the efficiency of your filtration system.