sera 08478 aquarium filter accessory

sera Siporax pond Professional 25 mm is a 10-litre pack of porous filter media engineered for biological pond filtration. The ceramic-like Siporax material offers a large internal and external surface area that supports colonization by beneficial nitrifying bacteria, which convert ammonia and nitrite into less harmful nitrate. This filtration media is designed for use in pond filters and biofilters to contribute to clearer water and a more stable aquatic environment.

Advantages

The porous structure and consistent 25 mm granule size provide a high specific surface area for bacterial growth while maintaining good water flow and low clogging tendency. The neutral material is chemically stable and does not alter water parameters, ensuring compatibility with a wide range of pond setups. Packaged as a 10-litre volume, it allows easy dosing by filter chamber or biofilter volume and supports long-term biological performance.

Suitable for

• Pond filters and external biofilters
• Koi ponds and garden ponds requiring biological ammonia/nitrite control
• Systems where high surface area media are needed without frequent maintenance
• Replacement or upgrade of existing biological media in multi-stage filtration systems

Key specifications

• Granule size: approximately 25 mm
• Pack volume: 10 litres
• Material type: porous ceramic-like media providing high surface area
• Function: biological filtration support for nitrifying bacteria
• Chemical characteristics: neutral and chemically stable in freshwater pond conditions

How to use

Rinse the media briefly with pond water before first use to remove dust. Place the media in the biological stage of the filter or in a dedicated biofilter chamber where water flow is steady but not turbulent. Ensure even distribution of flow through the media bed to maximize contact with nitrifying bacteria. For initial setup, allow time for bacterial colonization; monitoring of ammonia and nitrite levels is recommended until biological equilibrium is achieved.

Usage recommendations

Replace or top up portions of the media as part of planned maintenance if flow becomes significantly reduced or if the media becomes clogged with organic debris. Avoid cleaning the media with chlorinated tap water to preserve beneficial bacteria; use pond water for gentle rinsing when necessary.