• Natural volcanic rock
• Prevents the biofilm from shrinking
• Very good for biological fitration
• Provides bacteria with a large surface to grow on

Bio Rio is the basic of biological filtration. Biological filtration starts quickly after the initial setup, due to the live bacteria adhered on the Bio Rio. It is mainly made of pumice stone with a porous surface, which is ideal environment for beneficial bacteria to colonize. It also supports a long stable filtering activity.