{"product_id":"red-sea-filter-media-bags","title":"Red Sea Filter Media Bags","description":"\u003cp\u003e\u003cstrong\u003eA media bag, not a filter sock — know which one you need.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRed Sea Filter Media Bags are genuine Red Sea part R37401: high quality drawstring nylon bags, 12.5 x 25 cm (5\" x 10\"), two per pack, reusable. This is the same bag Red Sea supplies with its REEF-SPEC Carbon, now sold on its own for holding any loose chemical or mechanical media in a sump or filter chamber. It is sized on dimensions, not on a model number.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawstring closure\u003c\/strong\u003e — fills, ties and reopens without clips, so you can top up or swap media without replacing the bag.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo per pack\u003c\/strong\u003e — enough to run one and rinse one, which is how most people actually use them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable\u003c\/strong\u003e — Red Sea lists reusability as a feature. Rinse and refill rather than discard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTakes any loose media\u003c\/strong\u003e — carbon, GFO, phosphate remover, resins. Red Sea's own wording is that it suits all types of aquarium filter media.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe bag Red Sea ships with REEF-SPEC Carbon\u003c\/strong\u003e — if you have used their carbon, this is the bag it came in.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eRed Sea part number\u003c\/th\u003e\n\u003ctd\u003eR37401\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBag size\u003c\/th\u003e\n\u003ctd\u003e12.5 x 25 cm (5\" x 10\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e2 bags per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eNylon, drawstring closure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eReusable\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIntended media\u003c\/th\u003e\n\u003ctd\u003eAll types of loose aquarium filter media\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMicron rating\u003c\/th\u003e\n\u003ctd\u003eNot published by Red Sea — see below\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eSome overseas dealers list this bag as 14 x 25 cm and as holding 1000 mL. Red Sea's own figure is 12.5 x 25 cm, and Red Sea publishes no volume, so that is what this page states.\u003c\/p\u003e\n\n\u003ch3\u003eWill it fit my system?\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThis is not a model-specific part, and we are not going to pretend it is.\u003c\/strong\u003e Red Sea publishes no compatibility list for R37401 — no REEFER generation, no MAX model, nothing. It does not appear in any Red Sea manual, sump drawing or exploded parts diagram. It is a loose drawstring bag with no holder interface.\u003c\/p\u003e\n\u003cp\u003eSo the honest answer to \"will it fit?\" is dimensional. A 12.5 x 25 cm bag will sit in any sump chamber, media compartment or filter basket that has room for it. Measure the space you want to put it in. If a bag that size fits, this bag fits.\u003c\/p\u003e\n\u003cp\u003eFor reference, Red Sea's Filter Media Cup (part 42177) holds one litre of media, is described by Red Sea as suitable for REEFER and MAX systems, and ships with a media bag included. That is a claim about the cup, not about this bag, so do not read it as a fitment guarantee for R37401.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this is not\u003c\/h3\u003e\n\u003cp\u003eThe most common mistake with this part is buying it when you actually wanted a micron filter bag. They are different products with different jobs.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eIf you want to\u003c\/th\u003e\n\u003cth\u003eYou need\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHold carbon, GFO or resin in a sump\u003c\/th\u003e\n\u003ctd\u003eThis bag, R37401 — a drawstring media bag with no rated pore size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMechanically filter water through a rated pore size\u003c\/th\u003e\n\u003ctd\u003eA Red Sea micron filter bag — R42195 (100 micron felt), R42196 (225 micron felt) or R42197 (225 micron thin mesh)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrop media into a fitted holder in a REEFER or MAX sump\u003c\/th\u003e\n\u003ctd\u003eThe Red Sea Filter Media Cup, part 42177\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eRed Sea publishes no micron rating for R37401\u003c\/strong\u003e, only that it has an ideal mesh size for aquarium filter media. If your setup depends on a specific pore size, this is not the part — buy a rated micron bag instead.\u003c\/p\u003e\n\n\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRinse in old tank water or dechlorinated water, never under a hot tap.\u003c\/li\u003e\n\u003cli\u003eWash the bag out when you change media — a clogged bag chokes flow through the media inside it.\u003c\/li\u003e\n\u003cli\u003eRed Sea publishes no replacement interval. Replace when the mesh thins, the seams give, or the drawstring stops holding.\u003c\/li\u003e\n\u003cli\u003eDo not overfill. Media needs water moving through it, not packed around it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003ch4\u003eSuitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eActivated carbon, GFO and phosphate removers\u003c\/li\u003e\n\u003cli\u003eNitrate and organic removal resins\u003c\/li\u003e\n\u003cli\u003eAny loose granular media in a sump chamber or filter basket\u003c\/li\u003e\n\u003cli\u003eFreshwater and marine systems alike\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eNot suitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated mechanical filtration.\u003c\/strong\u003e No published micron rating means no guaranteed particle retention.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse as a filter sock in a sock holder.\u003c\/strong\u003e It has no collar or ring to seat in one.\u003c\/li\u003e\n\u003cli\u003eVery fine powdered media, which will wash straight through a mesh of unstated aperture.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-diy-net-cover-90cmx60cm-36-x-24\"\u003eRed Sea DIY Net Cover\u003c\/a\u003e — the other genuine Red Sea accessory most REEFER and MAX owners get around to eventually.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-marine-care-nitrite-nitrate-test-60-100-tests\"\u003eRed Sea Marine Care Nitrite\/Nitrate Test Kit\u003c\/a\u003e — measure the nitrate before and after you run a resin, or you will never know if it worked.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-marine-care-multi-test-kit\"\u003eRed Sea Marine Care Multi Test Kit\u003c\/a\u003e — the routine four parameters for a system running chemical media.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-pro-salt-20kg-refill-box-600ltr\"\u003eRed Sea Coral Pro Salt\u003c\/a\u003e — for the water changes that go alongside media changes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eRed Sea's warranty expressly does not cover normal wear and tear, or items that have a limited natural life or are consumable — Red Sea names filter socks and sponges among its examples. A media bag is a consumable and is not covered for wear. Any manufacturer warranty is in addition to your rights under the Australian Consumer Law and does not limit them.\u003c\/p\u003e\n\u003cp\u003eStandard freight. No dangerous goods or oversize handling applies.\u003c\/p\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eWhat is the Red Sea part number for these media bags?\u003c\/h4\u003e\n\u003cp\u003eR37401. Red Sea's own product page does not print the part number, but it is the code used by Red Sea's spare parts system and by Red Sea distributors for the 2-pack drawstring media bag.\u003c\/p\u003e\n\u003ch4\u003eWhich Red Sea systems do these bags fit?\u003c\/h4\u003e\n\u003cp\u003eRed Sea does not publish a model compatibility list for this bag, because it is a universal drawstring bag rather than a fitted part. At 12.5 x 25 cm it will sit in any sump chamber, media compartment or basket with room for it. Measure the space before ordering.\u003c\/p\u003e\n\u003ch4\u003eWhat micron are Red Sea filter media bags?\u003c\/h4\u003e\n\u003cp\u003eRed Sea does not publish a micron rating for R37401 — only that the mesh size suits aquarium filter media generally. If you need a rated pore size, use Red Sea's micron filter bags instead: R42195 at 100 micron, or R42196 and R42197 at 225 micron.\u003c\/p\u003e\n\u003ch4\u003eHow many bags come in a pack?\u003c\/h4\u003e\n\u003cp\u003eTwo. Red Sea's own specification reads 12.5 x 25 cm, 2 units.\u003c\/p\u003e\n\u003ch4\u003eCan I reuse them?\u003c\/h4\u003e\n\u003cp\u003eYes. Red Sea lists the bag as reusable. Rinse it out at each media change and replace it when the mesh thins or the drawstring gives up.\u003c\/p\u003e\n\u003ch4\u003eCan I use these in a freshwater tank?\u003c\/h4\u003e\n\u003cp\u003eYes. It is an inert nylon bag holding whatever media you put in it, so the water type makes no difference to the bag itself.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242229055779,"sku":"BA8874","price":12.6,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-filter-media-bags-43876723327267.webp?v=1790239539","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-filter-media-bags","provider":"Nicks AOT","version":"1.0","type":"link"}