{"product_id":"weco-fine-mesh-zipper-media-bag-4x8","title":"Weco Fine Mesh Zipper Media Bag (4 x 8 in) | Reusable Filter Bag for GFO, Resin \u0026 Fine Carbon","description":"\u003cstyle\u003e\n  .aq-pd { font-family: Georgia, serif; color: #1a1a1a; max-width: 860px; margin: 0 auto; line-height: 1.7; }\n  .aq-pd h2 { font-size: 1.45em; font-weight: 700; letter-spacing: -0.01em; border-left: 4px solid #FF5722; padding-left: 12px; margin: 2em 0 0.6em; }\n  .aq-pd p { margin: 0.5em 0 1em; }\n  .aq-callout { background: #1a1a1a; color: #fff; border-radius: 4px; padding: 16px 20px; margin: 1.6em 0; font-family: Arial, sans-serif; font-size: 0.93em; line-height: 1.6; }\n  .aq-callout strong { color: #f5c518; }\n  .aq-features { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; margin: 1em 0 1.6em; }\n  .aq-feature-card { background: #f4f4f4; border-radius: 4px; padding: 14px 16px; border-left: 3px solid #FF5722; font-family: Arial, sans-serif; font-size: 0.9em; }\n  .aq-feature-card strong { display: block; margin-bottom: 3px; color: #1a1a1a; }\n  .aq-feature-card span { color: #555; }\n  .aq-specs-table { width: 100%; border-collapse: collapse; margin-top: 1em; font-family: Arial, sans-serif; font-size: 0.93em; }\n  .aq-specs-table th { background: #1a1a1a; color: #fff; text-align: left; padding: 9px 14px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; font-size: 0.82em; }\n  .aq-specs-table td { padding: 8px 14px; border-bottom: 1px solid #e5e5e5; vertical-align: top; }\n  .aq-specs-table tr:nth-child(even) td { background: #f9f9f9; }\n  .aq-specs-table td:first-child { font-weight: 600; width: 45%; color: #444; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"aq-pd\"\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eWeco Fine Mesh Zipper Media Bag\u003c\/strong\u003e is the bag you grab for fine and powdery media — GFO, ultra-fine carbon, purifying resin, or any granular media that would slip through a coarse weave. The tight ~420-micron mesh holds the smallest grains in place while still letting water flow, and the full-length zipper keeps everything sealed even after a year of rinsing. Browse our full \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/filter-media-cartridges\"\u003efilter media \u0026amp; cartridges\u003c\/a\u003e or shop \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\"\u003emaintenance \u0026amp; water care\u003c\/a\u003e.\u003c\/p\u003e\n\n  \u003cdiv class=\"aq-callout\"\u003e\n    \u003cstrong\u003e~420-micron mesh.\u003c\/strong\u003e Tight enough to hold fine granular media, open enough to let your filter pump push water through. The full-length zipper seals tight after every rinse — \u003cstrong\u003eno drawstring slipping, no media leaking into your sump.\u003c\/strong\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eWhat It's For\u003c\/h2\u003e\n  \u003cp\u003eThis is the bag for \u003cstrong\u003efine, powdery, or small-granule media\u003c\/strong\u003e — Granular Ferric Oxide (GFO), ultra-fine activated carbon, phosphate-removing resin, nitrate-reducing resin, polishing resin, and similar small-particle filtration media. If you're running chunky media like ceramic rings, bio-balls, or pelletized carbon, grab the \u003cstrong\u003ecoarse mesh\u003c\/strong\u003e version instead — the fine weave creates more flow resistance than chunky media needs.\u003c\/p\u003e\n\n  \u003ch2\u003eFeatures\u003c\/h2\u003e\n  \u003cdiv class=\"aq-features\"\u003e\n    \u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eFine Nylon Mesh\u003c\/strong\u003e\u003cspan\u003e~420-micron weave holds fine granular media without letting it leak.\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eFull-Length Zipper\u003c\/strong\u003e\u003cspan\u003eStays sealed under flow — no drawstring slipping or media escape.\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eReusable\u003c\/strong\u003e\u003cspan\u003eRinse and reuse — one bag handles years of media swaps.\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003e4 × 8 in Size\u003c\/strong\u003e\u003cspan\u003eFits sumps, canister trays, HOB chambers, and most filter compartments.\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eFreshwater \u0026amp; Saltwater\u003c\/strong\u003e\u003cspan\u003eInert nylon is safe for community tanks, planted setups, and reef systems.\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003ePolishes Water\u003c\/strong\u003e\u003cspan\u003eTight weave also catches fine particulate as water passes through.\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eHow to Use\u003c\/h2\u003e\n  \u003cp\u003eFill the bag with your chosen media — for GFO and similar dense media, ½ to 1 cup is typical for a 4 × 8 bag. Zip it fully closed and rinse the bag under fresh water to flush any dust before placing it in your sump, canister tray, or HOB media basket. Position it where water flows through the bag rather than around it. Rinse the media every 2–4 weeks for GFO or as directed for other media. Replace the media on its own schedule and reuse the bag.\u003c\/p\u003e\n\n  \u003ch2\u003eSpecifications\u003c\/h2\u003e\n  \u003ctable class=\"aq-specs-table\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWeco\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMesh Type\u003c\/td\u003e\n\u003ctd\u003eFine (~420 micron)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e4 in × 8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eClosure\u003c\/td\u003e\n\u003ctd\u003eZipper\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eNylon mesh\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e1 bag\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eReusable\u003c\/td\u003e\n\u003ctd\u003eYes — rinse and reuse\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eFreshwater \u0026amp; saltwater\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBest For\u003c\/td\u003e\n\u003ctd\u003eGFO, fine carbon, polishing resin, purification resin\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eWE30408\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eRecommended Media to Pair With\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/red-sea-reef-spec-carbon-100g\"\u003eRed Sea REEF-SPEC Carbon\u003c\/a\u003e — fine carbon for reef tanks\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/aquaforest-purifying-resin\"\u003eAquaforest AF Purifying Resin\u003c\/a\u003e — freshwater nitrate-reducing resin\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/aquaforest-carbon-freshwater-1000ml\"\u003eAquaforest AF Carbon Freshwater\u003c\/a\u003e — granular carbon for FW\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brightwell-aquatics-purit-250ml\"\u003eBrightwell Purit\u003c\/a\u003e — chemical filtration media\u003c\/li\u003e\n    \u003cli\u003eBrowse the full \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/filter-media-cartridges\"\u003efilter media collection\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eFAQ\u003c\/h2\u003e\n  \u003cp\u003e\u003cstrong\u003eFine or coarse — which do I need?\u003c\/strong\u003e\u003cbr\u003eFine is for powdery or small-granule media (GFO, ultra-fine carbon, polishing resin). Coarse is for chunky media (carbon pellets, ceramic rings, bio-balls). If the media looks like sand, salt, or powder — go fine. If you can see individual chunks — go coarse.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eHow often should I rinse?\u003c\/strong\u003e\u003cbr\u003eFor GFO and dense reactor media, rinse every 2–4 weeks to clear gunk and keep flow rates up. For polishing resin or fine carbon, rinse monthly. The bag itself rarely needs replacing — just the media inside.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eIs the nylon safe for reef tanks?\u003c\/strong\u003e\u003cbr\u003eYes — inert nylon mesh is reef-safe and won't leach anything into the water column. Rinse before first use to clear manufacturing dust.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWill GFO leak through the fine mesh?\u003c\/strong\u003e\u003cbr\u003eNo — the ~420-micron weave is tight enough to hold standard GFO granules. Rinse the GFO well before bagging it to wash out the dust, then load into the bag and zip closed.\u003c\/p\u003e\n\n\u003c\/div\u003e\n","brand":"Weco","offers":[{"title":"Default Title","offer_id":48573379936475,"sku":"WE30408","price":3.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_7c72eb49-61a0-4fdd-89e4-dd14b7757916.png?v=1775563303","url":"https:\/\/squeakysaquatics.com\/products\/weco-fine-mesh-zipper-media-bag-4x8","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}