The Coralife Aquarium Bio Balls help let you maintain a larger than normal biological load in a much smaller filter area. The unique geometric design of our once inch bio-ball creates a large increase in surface area. These bio-balls are ideal for sump systems, refugiums, biological filters, canister filters and much more! One gallon of our bio-balls (roughly 300 balls) has a combined surface area of 21.5 square feet, and supports from 45-60 gallons of aquatic life.
Available in a 1-gallon box and also in a beautiful reusable 5-gallon bucket. Please let us know which you want. Default is a box if not indicated.