Bio-ball filter media MARINA TN-45171, Aqua Natura spherical bio ball, 46 mm diameter

MARINA Aqua Natura spherical bio ball (46 mm) is a plastic filter media designed to support mechanical and biological filtration in freshwater and marine aquariums. The open spherical shape and textured surface provide an extended area for beneficial nitrifying bacteria to colonize while also trapping suspended particles. The product is compatible with internal and external filter systems and can be used as standalone bio-media or combined with other mechanical and chemical media to create a multi-stage filtration setup.

Advantages

The bio ball offers a large specific surface relative to its size, promoting efficient biological nitrification and faster establishing of stable bacterial colonies. Its durable plastic construction resists degradation in both freshwater and saltwater environments and is easy to rinse for routine maintenance. The spherical design allows good water flow through and around each unit, minimising clogging while retaining particulate matter for subsequent mechanical removal.

Suitable for

• Internal canister and hang-on-back filters requiring biological media
• External sump chambers and refugiums for added bacterial surface area
• Freshwater community tanks and planted aquaria where biological stability is important
• Marine and reef-supporting systems as part of multi-stage filtration (when combined with protein skimmers and live rock)
• Quarantine or hospital tanks where reliable nitrification is required

When it may not be suitable

If space inside the filter is very limited, the 46 mm diameter of each bio ball may reduce the number that can be installed compared with smaller media options. In heavily planted tanks where mechanical filtration is minimal and fine detritus is common, these larger units may not trap the finest particulates as effectively as fine foam or matting media. Additionally, bio balls do not remove dissolved organics or phosphates; chemical media should be used if those removals are required.

Key specifications

• Shape: spherical, open-structured bio ball
• Material: durable aquarium-safe plastic suitable for freshwater and marine use
• Diameter: 46 mm
• Function: mechanical particle trapping and biological surface for nitrifying bacteria
• Flow characteristics: open design allowing water to pass through and around each unit

How to use

Rinse the bio balls in dechlorinated water before first use to remove any manufacturing dust. Place them in the biological stage of your filter, sump, or media chamber where steady water flow can contact the surfaces. Do not saturate with chemical media at the same location; allow water to pass through the bio balls to maintain oxygenation for beneficial bacteria. For initial cycling, monitor ammonia and nitrite levels until stable colonies develop. Clean by gentle rinsing in aquarium water during routine maintenance to avoid removing established bacteria colonies.

What to consider before purchase

• Confirm internal dimensions of your filter or media chamber to ensure 46 mm diameter units will fit
• Decide whether these will be used alone or combined with mechanical/chemical media
• Remember bio balls provide biological filtration but not chemical removal of dissolved substances
• Plan for regular, gentle rinsing rather than aggressive cleaning to preserve bacterial colonies

Usage recommendations

Use MARINA Aqua Natura spherical bio balls as part of a balanced filtration strategy: position them where steady flow and oxygen exchange are present, pair with appropriate mechanical pre-filtration to reduce clogging, and supplement with chemical media when removal of dissolved organics or phosphates is required. Regular monitoring of water parameters during cycling and maintenance will ensure reliable biological performance.