AquaNatura Biological Filter Brick media 38×38×30 mm, 20 kg pack

AquaNatura Biological Filter Brick media are ceramic-style filtration blocks sized 38×38×30 mm, supplied in a 20 kg pack for aquarium and pond biological filtration. These media provide extensive porous surface area for colonisation by nitrifying bacteria, supporting the biological removal of ammonia and nitrite. The blocks are designed to be compatible with a variety of filtration setups including canister filters, sumps and fluidised beds, allowing integration into existing systems to improve water quality and clarity.

Advantages

The AquaNatura Biological Filter Brick offers a stable, inert ceramic material that resists degradation and maintains structural integrity in freshwater and pond environments. Its uniform brick shape and consistent dimensions make packing, layering and media-retention straightforward in filter chambers. The high internal porosity increases contact area for beneficial bacteria, improving nitrification efficiency and helping to stabilise aquarium and pond ecosystems over time.

Suitable for

• Canister filters in home aquaria
• Sump systems in marine or freshwater setups
• Pond filtration units and external wet/dry filters
• Fluidised bed filters and reactors designed for granular/brick media

When it may not be suitable

These ceramic bricks are intended specifically for biological filtration and are not intended to be used as a mechanical polishing media; fine particulates may pass through and require separate mechanical filter pads or floss. They are sized for systems that can accommodate 38×38×30 mm blocks; very small filters or compact cartridge systems with fixed media compartments may not accept this shape or size.

Key specifications

• Material: ceramic-style porous filtration media
• Dimensions per block: 38 × 38 × 30 mm
• Pack weight: 20 kg
• Intended use: biological filtration for freshwater and pond systems
• Form: rigid brick-shaped blocks with internal porosity

How to use

Rinse the filter bricks gently in dechlorinated water to remove dust from packaging before first use. Place the bricks in the biological stage of a canister, sump or pond filter so that water flow passes through the media for effective contact with the internal porous surface. Avoid compressing the bricks tightly against filter walls or screens; allow even flow and some void space for water movement. For fluidised bed applications, ensure the reactor is rated to handle rigid brick-shaped media or consider using a contained chamber that provides controlled flow.

What to consider before purchase

• Check internal filter dimensions and media chamber size to confirm 38×38×30 mm blocks fit
• Determine required volume of biological media for your aquarium/pond to achieve effective nitrification
• Plan for separate mechanical filtration if fine particulate removal is needed
• Confirm suitability for freshwater or pond systems as required

Usage recommendations

Introduce the bricks gradually into an established biological filter where possible; monitor ammonia and nitrite levels during the initial colonisation period. Maintain stable flow and avoid frequent complete media replacement — replace only damaged or heavily clogged blocks and preserve bacterial colonies by rinsing gently in aquarium water during routine maintenance.