Gravity Aerobic Biofilter

The gravity biofilter is a biological filtration system used in aquaculture to maintain optimal water quality, especially in recirculating systems or low water consumption setups. It relies on gravity to circulate the water through a filtering medium where nitrifying bacteria break down nitrogen compounds such as ammonia.

How It Works

Water containing nitrogenous waste (such as ammonia produced by fish) naturally flows under gravity through a filtering medium. This medium may consist of materials like plastic beads, ceramic supports, or special foam. Nitrifying bacteria settle on the medium and convert ammonia into nitrites and then nitrates, a process known as nitrification.

Advantages

• Gravity-powered: Operates without additional energy, reducing operational costs.

• Easy maintenance: Fewer moving parts and simple system cleaning.

• Biological efficiency: Helps maintain stable water quality by reducing ammonia and nitrite levels.

• Durability: Resistant materials with long system lifespan.

Applications

• RAS (Recirculating Aquaculture Systems): Used to treat water in controlled environments.

• Hatcheries and nurseries: Ideal for young fish or fry installations.

• Aquaponics: Used in systems combining aquaculture and plant cultivation.

• Extensive fish farming and aquaculture: Suitable for less intensive setups.