1.Outstanding Filtration: Our biofilter balls are covered in spines to dramatically increase the surface area of each ball to nearly 2 square feet providing space for a massive number of beneficial bacteria to colonize. These good bacteria break down harmful organic waste. 2.Tough and Unique: Our bulk bio balls spherical shape and precise spine placement permits them to pack tightly into any shape or filter type without losing surface area. Molded from high density plastic, these bio media balls are lightweight but tough enough to keep their shape and will never degrade or wear out. This makes these heavy-duty bulk bio balls perfect for pond filters for outdoor ponds or as a bio media for aquarium filter. 3.Trusted: Our bio filter balls are 100% polypropylene making them a safe reliable biological media for use as koi pond bio filter media, freshwater aquariums, and for saltwater fish tank bio media, aquaponics bulk bio balls media, and much more. These bio media balls can be used loose or in the mesh bag with plastic zipper. 4.We are a competitive manufacturer in the aquarium field. We are mainly engaged in the development, production and sales of aquarium filter media and various aquarium accessories. Our main products are: sponge filter, bio sponge, Japan mat, filter brush, bio ball, ceramic rings, active carbon, air stone, etc. We can produce products of various sizes, shapes, and colors according to your needs. Samples or drawings are welcome.