Description
Seachem De*nitrate 4L — High-capacity porous mineral Media with dense bacterial colonies for biological nitrate elimination in freshwater and saltwater aquariums
Seachem De*nitrate 4L (SKU: 724958-139) is a bulk commercial-grade biological filtration media designed to reduce elevated nitrate, nitrite, and ammonia levels in freshwater and saltwater aquariums. Composed of an ultra-porous natural mineral substrate, it hosts dense bacterial colonies within its micro-porous matrix. When installed in low-flow filtration configurations, it fosters anaerobic biological zones that break down nitrate molecules into harmless nitrogen gas.
The unique physical structure of De*nitrate ensures permanent biological support without leaching adsorbed compounds back into the water column or exhausting over time. Its high internal surface area per unit volume provides long-lasting nitrate management in heavily stocked fish tanks, planted aquariums, and marine sumps.
Usage & Application
When to Use
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High-Bioload Systems: Ideal for aquariums experiencing ongoing nitrate accumulation due to high fish densities or heavy feeding.
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Anaerobic Denitrification: Perfect for filling low-flow canister trays, biological reactors, or dedicated sump media compartments.
Placement & Flow Guide
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Place media into a fine mesh media bag and position it in your filtration system.
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Water Flow Requirement: Ensure water flow through the media bed remains below 200 L/h (50 US GPH) to maintain anaerobic internal conditions.
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Pre-Filtration: Pre-filter water through a mechanical sponge or filter floss to prevent detritus from clogging outer pores.
Product Specifications & Highlights
Key Features
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Porous Mineral Matrix: High internal surface area supports millions of nitrifying and denitrifying microbes.
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Biological Nitrogen Cycle Completion: Converts nitrate (NO₃⁻) directly into free nitrogen gas.
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Non-Exhausting Media: Physical stone structure provides permanent bio-housing without requiring chemical regeneration.
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Water Parameter Safe: Chemically inert substrate will not alter pH, hardness, or alkalinity levels.
Product Details
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Brand: Seachem
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SKU: 724958-139 (Internal ID: 130704)
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Barcode (GTIN/UPC): 000116013901
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Product Type: Aquarium Filter Media / Biological Nitrate Control
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Package Dimensions: 160 mm (L) × 160 mm (W) × 310 mm (H)
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Gross Package Weight: 2,800 g
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Net Volume: 4,000 mL (4 Litres)
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Target Environment: Low-Flow Freshwater & Marine Filtration
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Filtration Capacity: Treats up to 1,600 Litres (400 US gallons) at low flow rates (<200 LPH)





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