Aquapapa 4000 PCS 1" Bulk Biochemical Bio Balls with Sponge Core Design Filter Media for Aquarium Fish Pond Fountain Waterfall Filtration

Ball size: 1" in diameter,These plastic bio balls are great for your fish tank and garden pond filtration. They are made of polypropylene and safe to use in freshwater and saltwater. With a new design of sponge core, they provide large amount of surface area in a small surface and help produce turbulence, which helps with the gas exchange process and increase dissolved oxygen levels.,Bio balls do not require replacement unless damaged. In the event of excessive buildup, you may gently rinse with water from an established aquarium, if desired.,4000 pcs in the package. Approx. 2.2 cu.ft.