The PURO modular filter system comes complete with 4 levels of high-quality filtering media. Including heavy-duty filter brushes, KINSHI filter media, fine pore sponge and COBALT BIOGLOBES. Each level of filtration is specifically designed to complement the other media in the system, resulting in crystal clear, healthy water for your koi or goldfish. Easy to assemble, hide and maintain, the PURO is designed for the water garden and koi pond hobbyist in mind and is built to last. Featuring, individual media baskets, shock and UV resistant outer case, pre-installed media, complete plumbing connections, and 3 models to choose from. Model 1 features a single unit with filter brushes, Kinshy sponge and bio-balls. Model 2 features 2 units with filter brushes, Kinshy sponge, fine pore filter sponge and bio-balls. Model 3 features 3 units with filter brushes, double Kinshy sponge, double fine pore filter sponge and double bio-balls.