Aquarium filter media sera Siporax Nitrat-minus Professional 500 ml – biological nitrate reduction media

sera Siporax Nitrat-minus Professional 500 ml is a porous biological filter media engineered to support nitrate reduction in freshwater and marine aquaria. The granulated ceramic material offers extensive internal and external surface area for colonization by denitrifying bacteria, enabling biological conversion of nitrate compounds. The product is supplied as a 500 ml portion suitable for use in external canister filters, internal filters, sumps, and fluidized-bed systems where enhanced biological filtration and nitrate control are required.

Advantages

The porous structure promotes establishment of an active bacterial community that converts nitrate under low-oxygen conditions, helping to reduce nitrate accumulation without chemical additives. The granules are chemically stable and resistant to breakdown, providing long-term surface area for biofilm formation. Because it is a physical media designed for biological action, it can be integrated with mechanical and chemical filtration stages to maintain overall water clarity and quality.

Suitable for

• Freshwater aquaria with plants and fish where nitrate control is required
• Marine and reef systems as a supplemental biological nitrate reducer
• External canister filters, internal filters and filter sumps
• Fluidized-bed reactors and denitrification chambers

Key specifications

• Form: porous ceramic granules with high internal surface area
• Volume: 500 ml packed portion
• Intended function: supports denitrifying bacterial colonization for biological nitrate reduction
• Compatibility: suitable for freshwater and marine filtration setups
• Physical durability: resistant to mechanical breakdown under normal filter flow

How to use

Rinse the media briefly in dechlorinated water to remove dust from packing. Place the granules in a dedicated media chamber, fluidized-bed reactor, or a fine-mesh bag inside the filter where flow promotes contact with low-oxygen zones. Ensure the media receives continuous, moderate water flow; avoid direct exposure to strong mechanical agitation that could cause abrasion. Monitor nitrate levels regularly and combine with regular mechanical filtration and water changes as part of routine maintenance. Replace or top up the media volume only when performance declines noticeably, rather than on a fixed short-term schedule.

Usage recommendations

Use sera Siporax Nitrat-minus Professional as part of a multi-stage filtration approach: mechanical pre-filtration to remove solids, biological media for nitrification and denitrification, and optional chemical media when required. Regularly test nitrate concentrations and adjust media quantity and flow patterns to maintain target water quality for your specific aquarium inhabitants.