{"product_id":"seachem-matrix-4-l","title":"Matrix 4 L — Biomedia 700 m²\/L Nitrification and Denitrification | Seachem","description":"\u003cp\u003eSeachem Matrix 4 L is the largest size in the Matrix range, a high-porosity biomedia designed for efficient biofiltration and nitrogen removal in marine and freshwater aquariums. This 10 mm diameter porous inorganic solid provides a surface area of ​​over 700 m² per liter—the equivalent of 170 liters of plastic balls. Its macropores simultaneously support nitrifying and denitrifying bacteria. The 4 L size treats up to 3200 L (800 US gallons), making it the most economical choice for large reef systems, multiple setups, or aquarists who fill several filters.\u003c\/p\u003e\n\n\n\u003ch2\u003e Main advantages\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e Surface area of ​​over 700 m² per liter — equivalent to 170 liters of plastic pellets\u003c\/li\u003e\n\n\u003cli\u003e Internal and external macroporous surface — supports nitrifying AND denitrifying bacteria\u003c\/li\u003e\n\n\u003cli\u003e Simultaneously removes ammonia, nitrites AND nitrates in the same filter\u003c\/li\u003e\n\n\u003cli\u003e Completely inert — does not degrade, never needs to be replaced\u003c\/li\u003e\n\n \u003cli\u003eRinseable without damaging bacteria — the majority are lodged inside the pores\u003c\/li\u003e\n\n\u003cli\u003e 4L size — the most economical in the range, treats up to 3200L (800 US gallons)\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Use in reef and marine aquariums\u003c\/h2\u003e\n\n\u003cp\u003e Matrix is ​​unique among biomedia because its macropores support both aerobic bacteria (which remove ammonia and nitrites) and anaerobic bacteria (which reduce nitrates). This dual action allows for complete biofiltration in a single filter. Seachem recommends placing the biological media last in the filtration order: first mechanical filtration (foams, filter floss), then chemical filtration (MatrixCarbon, Purigen, PhosGuard), and finally biological filtration (Matrix). Matrix does not affect the aquarium's pH.\u003c\/p\u003e\n\n\n\u003ch2\u003e Instructions for use\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e 250 ml of Matrix per 200 L (50 US gallons) of water — the 4 L format treats up to 3200 L\u003c\/li\u003e\n\n\u003cli\u003e Rinse before use\u003c\/li\u003e\n\n \u003cli\u003ePlace in a cartridge filter, media reactor, box filter, or any high-flow area of ​​the sump\u003c\/li\u003e\n\n\u003cli\u003e Large enough that a filter bag is not required in most applications\u003c\/li\u003e\n\n\u003cli\u003e Particularly effective in a canister filter or a dedicated sump compartment\u003c\/li\u003e\n\n\u003cli\u003e Use with Seachem Stability to establish the biofilter more quickly\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Interview\u003c\/h2\u003e\n\n\u003cp\u003e The Matrix filter does not wear out and never needs replacing. However, it can become clogged with debris and biofilm. Seachem recommends regular filter maintenance—about once a month as a starting point. Since the majority of bacteria are inside the pores, the Matrix can be rinsed with aquarium water to remove debris without damaging the biofilter.\u003c\/p\u003e\n\n\n\u003ch2\u003e Matrix vs de*nitrate\u003c\/h2\u003e\n\n \u003cp\u003eIf Matrix keeps your nitrate levels stable but doesn't lower them, increase the amount of Matrix or add Seachem de*nitrate, which removes nitrates more effectively per unit volume at a flow rate not exceeding 200 L\/h. For higher flow rates, Matrix supports anaerobic denitrification more effectively. The necessary anaerobic bacteria typically take a few weeks to colonize the internal pores.\u003c\/p\u003e\n\n\n\u003ch2\u003e Manufacturer's precautions\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e Does not affect pH\u003c\/li\u003e\n\n\u003cli\u003e Completely inert — does not degrade\u003c\/li\u003e\n\n\u003cli\u003e Compatible with all types of wet or wet-dry filters\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Available formats\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e 250 ml\u003c\/li\u003e\n\n\u003cli\u003e 500 ml\u003c\/li\u003e\n\n\u003cli\u003e 1 L\u003c\/li\u003e\n\n\u003cli\u003e 2 L\u003c\/li\u003e\n\n\u003cli\u003e 4 L\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Why choose the Matrix at ReefSolution?\u003c\/h2\u003e\n\n \u003cp\u003eThe 4L format offers the best cost per liter in the Matrix range for serious aquarists. It allows you to fill a full canister and a sump compartment simultaneously, or to maintain multiple aquariums. To quickly establish your biofilter, combine Matrix with Seachem Stability. Complete your chemical filtration with Seachem Purigen and Seachem MatrixCarbon.\u003c\/p\u003e\n\n\n\u003ch2\u003e Frequently Asked Questions\u003c\/h2\u003e\n\n\n\u003ch3\u003e Is the 4L format the most economical in the range?\u003c\/h3\u003e\n\n\u003cp\u003e Yes. The 4L offers the best cost per liter and treats up to 3200 L (800 US gallons). It can fill multiple filters or a large sump and never needs replacing, making it a long-term investment.\u003c\/p\u003e\n\n\n\u003ch3\u003e Can the Matrix be divided into several filters?\u003c\/h3\u003e\n\n\u003cp\u003e Yes. The 4L bulk format can be divided between a cartridge filter and a sump compartment, or between several aquariums. Dose 250ml per 200L of water per system.\u003c\/p\u003e\n\n\n\u003ch3\u003e Does the Matrix remove nitrates as effectively as a biopellet reactor?\u003c\/h3\u003e\n\n \u003cp\u003eThe Matrix supports anaerobic denitrification thanks to its internal macropores, but functions differently from biopellets, which provide a carbon source for bacteria. For systems with persistently high nitrate levels, combine the Matrix with Seachem de*nitrate or consider a dedicated reactor, depending on the system's organic load.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"Default Title","offer_id":46122761617579,"sku":"19171","price":59.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/19171.jpg?v=1773618294","url":"https:\/\/reefsolution.com\/en\/products\/seachem-matrix-4-l","provider":"Aquarium ReefSolution inc.","version":"1.0","type":"link"}