Bio-Mate Refillable Ceramic Media Balls

Provides maximum surface area with the greatest possible mix of air and water. Cultivates nitrifying bacteria. Promotes gas exchange, increases dissolved oxygen level, and removes harmful gases. Will not clog with organic matter. Manufacturer of the highest grade of thermoplastic material. Totally inert and non-leaching. Each ball is approximately 1-1/2" diameter; containers are 1-gal size.