{"product_id":"seachem-denitrate","title":"de*nitrate — Natural Anaerobic Denitrification Biomedia 500 ml, 1 L and 4 L - Seachem","description":"\u003cp\u003e\u003cstrong\u003eSeachem de*nitrate\u003c\/strong\u003e is an economical, natural, porous biomedia whose pore distribution and geometry promote both aerobic nitrification at the surface and \u003cstrong\u003eanaerobic denitrification at the core of the media\u003c\/strong\u003e. It removes nitrate by the same process as live rock, with efficiency magnified several fold by forcing water to filter through its porous structure. No danger of hydrogen sulfide production, unlike sulfur-based media.\u003c\/p\u003e\n\n\u003ch2\u003eMain advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eNatural anaerobic denitrification — removes nitrate like live rock, with greater efficiency\u003c\/li\u003e\n\u003cli\u003eDual function: aerobic nitrification (ammonia, nitrite) + anaerobic denitrification (nitrate)\u003c\/li\u003e\n\u003cli\u003eHigh porosity natural material — pore size well suited to anaerobic bacteria\u003c\/li\u003e\n\u003cli\u003eNo danger of hydrogen sulfide — unlike sulfur-based media\u003c\/li\u003e\n\u003cli\u003eDoes not get used up — a permanent biomedia as long as nitrate stays under control\u003c\/li\u003e\n\u003cli\u003eThree sizes offered: 500 ml, 1 L and 4 L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFlow rate decides everything\u003c\/h2\u003e\n\u003cp\u003ede*nitrate works thanks to its porous structure: oxygen is consumed by aerobic bacteria at the surface, which creates anaerobic conditions at the core of the media, where denitrifying bacteria remove nitrate.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eBelow 200 L\/h (50 US gallons\/h)\u003c\/strong\u003e: functions as both an aerobic filter and an anaerobic denitrifying filter\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAbove 400 L\/h (100 US gallons\/h)\u003c\/strong\u003e: functions solely as an aerobic filter — no nitrate removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe manufacturer is categorical: \u003cstrong\u003ede*nitrate absolutely must be used at a flow rate of 200 L\/h (50 GPH) or less to be effective at removing nitrate.\u003c\/strong\u003e If higher flow rates are unavoidable, Seachem recommends Matrix or Pond Matrix.\u003c\/p\u003e\n\n\u003ch2\u003eDirections (Seachem)\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRinse off the dust before use\u003c\/li\u003e\n\u003cli\u003ePlace so as to assure the flow of water through it: a canister filter, chemical filtration module, box filter or media reactor\u003c\/li\u003e\n\u003cli\u003eFlow rate should not exceed 200 L\/h (50 US gallons per hour)\u003c\/li\u003e\n\u003cli\u003eOnce in use for several days, nitrate concentrations should start to fall and level off gradually around \u003cstrong\u003e4 to 5 mg\/L\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eAs long as nitrate concentrations remain under control, the product is not exhausted\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eIf very high nitrates are initially present, bring them down below 20 mg\/L with water changes BEFORE relying on the media\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eUse enough media to remove nitrate at least as fast as the rate of formation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eYield and official dosing table\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEach 500 mL of de*nitrate treats about 100 to 200 L (25 to 50 US gallons)\u003c\/strong\u003e, depending on the initial nitrate concentration and the current biological load.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\u003cth\u003eWater volume\u003c\/th\u003e\u003cth\u003ede*nitrate dose\u003c\/th\u003e\u003cth\u003eImperial\u003c\/th\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e1 gal \/ 4 L\u003c\/td\u003e\u003ctd\u003e20 mL\u003c\/td\u003e\u003ctd\u003e4 tsp\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e10 gal \/ 20 L\u003c\/td\u003e\u003ctd\u003e200 mL\u003c\/td\u003e\u003ctd\u003e4\/5 cup\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e20 gal \/ 40 L\u003c\/td\u003e\u003ctd\u003e400 mL\u003c\/td\u003e\u003ctd\u003e1 2\/5 cups\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e60 gal \/ 200 L\u003c\/td\u003e\u003ctd\u003e1,200 mL\u003c\/td\u003e\u003ctd\u003e4 1\/5 cups\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ede*nitrate or Matrix?\u003c\/h2\u003e\n\u003cp\u003eBoth are permanent biomedia that support denitrification, but their applications differ. \u003cstrong\u003ede*nitrate\u003c\/strong\u003e is smaller (gravel-sized) and more efficient per volume for nitrate reduction at low flow — ideal in a dedicated reactor or a slow-flow filter. \u003cstrong\u003eMatrix\u003c\/strong\u003e is larger (10 mm) and supports denitrification at higher flow rates — ideal in a canister or sump. The two can be combined.\u003c\/p\u003e\n\n\u003ch2\u003eMaintenance\u003c\/h2\u003e\n\u003cp\u003ede*nitrate does not get used up, but it can clog with detritus and biofilm. Pre-filtering the water upstream with foam or filter floss significantly extends its useful life. Rinse periodically with aquarium water if needed, without destroying the internal bacteria.\u003c\/p\u003e\n\n\u003ch2\u003eAvailable sizes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e500 ml\u003c\/li\u003e\n\u003cli\u003e1 L\u003c\/li\u003e\n\u003cli\u003e4 L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRounding out your biological filtration\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/seachem-matrix\"\u003eSeachem Matrix\u003c\/a\u003e — the biomedia to use when your flow exceeds 200 L\/h, as recommended by the manufacturer\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/stability-250-ml\"\u003eSeachem Stability\u003c\/a\u003e — nitrifying bacteria to speed up colonization of fresh media\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/salifert-nitrate-test-kit\"\u003eSalifert Nitrate Test Kit\u003c\/a\u003e — essential: the test is what tells you whether the media is working\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/seachem-the-bag\"\u003eSeachem The Bag\u003c\/a\u003e — the filter bag to hold the media in a box filter or a sump compartment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat flow rate is actually needed for nitrate removal?\u003c\/h3\u003e\n\u003cp\u003e200 L\/h (50 GPH) or less, no compromise. Above 400 L\/h, de*nitrate remains an excellent aerobic nitrification media — it handles ammonia and nitrite — but it no longer removes nitrate. The manufacturer points to Matrix in that case.\u003c\/p\u003e\n\u003ch3\u003eDoes de*nitrate work if you simply drop it in the sump?\u003c\/h3\u003e\n\u003cp\u003ePlaced loose in a sump, flow is generally too high for denitrification: the media then acts as an aerobic filter. To target nitrate, you need a compartment or reactor where the flow passing through the media stays below 200 L\/h. It is the flow through the media that matters, not the total system flow.\u003c\/p\u003e\n\u003ch3\u003eMy nitrates are very high — will de*nitrate bring them down on its own?\u003c\/h3\u003e\n\u003cp\u003eThe manufacturer asks that nitrates first be brought \u003cstrong\u003ebelow 20 mg\/L with water changes\u003c\/strong\u003e. The media is designed to remove nitrate at the rate it forms, not to catch up on a major accumulation. Once the level is brought down, it holds it around 4 to 5 mg\/L.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"1 L","offer_id":38010075644075,"sku":"000116013703","price":17.99,"currency_code":"CAD","in_stock":true},{"title":"500 ml","offer_id":47561053044907,"sku":"000116013307","price":9.99,"currency_code":"CAD","in_stock":true},{"title":"4 L","offer_id":47561053077675,"sku":"19397","price":57.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/products\/19249.jpg?v=1773621389","url":"https:\/\/reefsolution.com\/en\/products\/seachem-denitrate","provider":"Reef Solution","version":"1.0","type":"link"}