Pond Filter Sponge: Replacement filter pads for CUF-6000, Sunsun 660 GPH Fountain Pump and 530660 GPH Pond Filter Pump, designed to be compatible with multiple pond filtration systems while traveling Effective Filtration: High-density polyurethane sponge material captures impurities and suspended particles, improving water clean and extending pump lifespan by avoiding frequent maintenance Long Lasting Performance: Made from wear-resistant sponge that maintains shape and elasticity over time, providing reliable filtration performance with minimal degradation Easy Maintenance: Simple disassembly allows quick cleaning of the fountain filter sponge, saving time and effort during routine upkeep without hassle Size Specification: Measures 12 x 9 x 1.38 inches, blue in color; verify dimensions against your system to guarantee proper fit and functionality