{"title":"Bulk Sterile Substrate Bags","description":"\u003ch1\u003e\u003cstrong\u003eBulk Mushroom Substrate Bags UK\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eStock up with confidence - our sterile substrate bags are made in Kent, UK for dependable batch-to-batch consistency. Designed for commercial farms and scaling producers, our bulk sterile mushroom substrate bags offer the consistent hydration and absolute sterility required for high-yield mycelium colonisation, without the overhead of running your own autoclave.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhy Partner with Martian Mushrooms?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK Manufacturer:\u003c\/strong\u003e Direct from our dedicated laboratory in Kent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLab-Grade Sterility:\u003c\/strong\u003e Professional-grade sterilisation processes ensuring 100% contaminant-free substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Savings:\u003c\/strong\u003e Bigger orders, bigger savings. Discounts from 25 packs all the way to 1000+.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e: We’ve got your back - sterility issues? We’ll replace it, no questions, for you and your customers too.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Supply:\u003c\/strong\u003e No MOQs on standard orders; BNPL available via Klarna and Shop Pay.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Shipping:\u003c\/strong\u003e From dropshipping to 3PL, we make it work for you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick Turnaround:\u003c\/strong\u003e UK-wide delivery you can actually rely on - keeps your shelves stocked without drama.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/sterilised-substrate\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFor Bulk Growers (farms, scaling producers \u0026amp; high-volume cultivators)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eIf you’re prepping tubs back-to-back, consistency matters. Our wholesale sterile substrate bags are made to minimise variables so your focus stays on throughput and yield targets:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistency at commercial scale:\u003c\/strong\u003e tight production controls and repeatable batches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSterility-first manufacturing:\u003c\/strong\u003e built for clean inoculations and stable colonisation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply-chain reliability:\u003c\/strong\u003e direct-from-manufacturer availability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorkflow efficiency:\u003c\/strong\u003e bulk quantities reduce ordering friction and stock-outs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupport for scaling:\u003c\/strong\u003e custom specs and scheduling available for recurring demand\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eFor Product Sellers (retailers, hydroponics shops \u0026amp; resellers)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eYour customers pay attention. To everything. A tiny contaminant. A week where stock runs dry. Even a batch that’s technically fine but just… underwhelming. It doesn’t take much for confidence to dip, and once it does, it’s hard to win back.\u003c\/p\u003e\n\u003cp\u003eThat’s why our trade-prepared sterile substrate bags aren’t simply about supplying mushrooms. They’re about protecting your profit and your name at the same time - because in retail, those two are closely tied together.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Supply:\u003c\/strong\u003e Restock confidently, without last-minute surprises or inconsistent supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetail-friendly:\u003c\/strong\u003e The Lifetime Guarantee helps minimise risk and keeps aftersales issues to a minimum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand Your Range:\u003c\/strong\u003e Choose white-label for a seamless addition to your shelf, or opt for fully custom production tailored to your business.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffortless Fulfilment:\u003c\/strong\u003e We take care of dropshipping and 3PL, keeping your supply chain reliable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerks for Growth:\u003c\/strong\u003e Tiered pricing, priority help, and some added bonuses that make running your business just a little easier.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Range Overview\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis collection focuses on our core bulk substrate bag line:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Sterilised CVG Mushroom Substrate Bag\u003c\/strong\u003e - Clean, ready-to-use CVG substrate that’s easy to work with. Colonises fast and evenly - perfect for a wide range of mushroom species.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Sterilised Master's Mix Mushroom Substrate Bag\u003c\/strong\u003e - Clean, ready-to-use Master’s Mix packed with nutrients. Colonises dense and strong - ideal for gourmet and wood-loving mushrooms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eNeed a Full Production Pipeline?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003ePair these bags with our \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/bulk-sterile-mushroom-grain-bags\"\u003eBulk Mushroom Grain Bag\u003c\/a\u003e or \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/bulk-mushroom-fruiting-blocks\"\u003eBulk Fruiting Blocks\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"bulk-sterilised-cvg-mushroom-substrate-bag","title":"Bulk Sterilised CVG Mushroom Substrate Bag","description":"\u003ch1\u003eBulk Sterilised CVG Mushroom Substrate Bag – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your spawn production with lab-prepped coco coir, vermiculite and gypsum substrate that’s ready to mix with grain spawn. Built for growers who care about consistent colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach CVG substrate bag is prepared in cleanroom conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose between 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWholesale‑Ready Sterilised CVG Blend\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOur sterilised CVG substrate is a ready-to-use bulk fruiting substrate designed for high-throughput cultivation and trade resale. Each bag is produced under controlled processes to prioritise sterility, consistency, and supply reliability.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile CVG substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/sterilised-cvg-mushroom-substrate-bag\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Advantages\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh water-holding capacity\u003c\/strong\u003e - CVG acts like a moisture reservoir, supporting fuller flushes and reducing the need to over-mist or fight drying.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - CVG is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eWhat You Get\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated coco coir, vermiculite and gypsum blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready to inoculate on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eBuilt For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a sterile CVG substrate line with repeatable quality\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven CVG substrate blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine spawn-to-bulk runs with clean, fully colonised grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003ePerfect For\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning to bulk in tubs using CVG bulk substrate\u003c\/li\u003e\n\u003cli\u003eDialing in consistent surface conditions (hydration + airflow) to support strong, even colonisation and pinning\u003c\/li\u003e\n\u003cli\u003eRepeatable grow cycles when you want predictable bulk-run timing (varies by culture, spawn ratio, and environment)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eWhat’s Included\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2kg sterilised CVG substrate bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eHow It Works\u003c\/strong\u003e\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and clean your tub\/tray.\u003c\/li\u003e\n\u003cli\u003eBreak up your fully colonised grain spawn in its bag\/jar so it mixes evenly.\u003c\/li\u003e\n\u003cli\u003eMix spawn with CVG bulk substrate in your tub\/tray until evenly distributed.\u003c\/li\u003e\n\u003cli\u003eLevel and lightly compress the surface to create a uniform top layer.\u003c\/li\u003e\n\u003cli\u003eIncubate until the bulk is fully colonised.\u003c\/li\u003e\n\u003cli\u003eIntroduce fruiting conditions once fully colonised (fresh air + surface humidity balance).\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003e\u003cstrong\u003eQuality Guarantee\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: CVG substrate is soaked\/cooked, hydrated to field capacity, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003cbr\u003e\u003cbr\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBulk Sterilised CVG Mushroom Substrate Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCVG blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCoco coir, vermiculite, gypsum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eField capacity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUse guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMix with colonised grain spawn\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003e\u003cstrong\u003eMartian Mushrooms vs. Competitors\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Premium Coco Coir, Vermiculite and Gypsum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let substrate prep slow you down. Ensure your supply chain with the UK's most reliable CVG bulk substrate.\u003c\/p\u003e\n\u003cp\u003eNeed a custom quote, white labelling, or pallet pricing (100+ units)?\u003c\/p\u003e\n\u003cp\u003eJoin our \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eGrowth Partner Program\u003c\/a\u003e.\u003c\/p\u003e","brand":"Martian Mushrooms","offers":[{"title":"25","offer_id":56356947099992,"sku":null,"price":283.5,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":56356947132760,"sku":null,"price":540.5,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":56356947165528,"sku":null,"price":986.0,"currency_code":"GBP","in_stock":true},{"title":"250","offer_id":56356947198296,"sku":null,"price":2242.5,"currency_code":"GBP","in_stock":true},{"title":"500","offer_id":56356947231064,"sku":null,"price":3955.0,"currency_code":"GBP","in_stock":true},{"title":"1000","offer_id":56356947263832,"sku":null,"price":6950.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0829\/2430\/6776\/files\/BulkSterilisedCVGMushroomSubstrateBag2kg.png?v=1765210762"},{"product_id":"bulk-sterilised-masters-mix-mushroom-substrate-bag","title":"Bulk Sterilised Master's Mix Mushroom Substrate Bag","description":"\u003ch1\u003eBulk Sterilised Master's Mix Mushroom Substrate Bags – 25–1000 Unit Packs\u003c\/h1\u003e\n\u003cp\u003eScale up your spawn production with lab-prepped hardwood, soyhulls and gypsum substrate that’s ready to mix with grain spawn. Built for growers who care about consistent colonisation, clean results, and a supply they can actually rely on.\u003c\/p\u003e\n\u003cp\u003eEach Master's Mix substrate bag is prepared in clean room conditions and sterilised in a computer-controlled autoclave, taking the guesswork out of prep so you can focus on growing, not fixing problems.\u003c\/p\u003e\n\u003cp\u003eChoose 2kg or 3kg bags in 25, 50, 100, 250, 500 or 1000 unit packs for commercial consistency and better unit economics.\u003c\/p\u003e\n\u003cp\u003eNeed trade support, custom scheduling, or a tailored quote? \u003ca href=\"https:\/\/martian-mushrooms.com\/pages\/wholesale-services\"\u003eContact us\u003c\/a\u003e and we’ll build a supply plan around your volume.\u003c\/p\u003e\n\u003ch2\u003eWholesale‑Ready Sterilised Master's Mix Blend\u003c\/h2\u003e\n\u003cp\u003eOur sterilised Master's Mix substrate is a ready-to-use bulk fruiting substrate designed for high-throughput cultivation and trade resale. Each bag is produced under controlled processes to prioritise sterility, consistency, and supply reliability.\u003c\/p\u003e\n\u003ch3\u003eIdeal for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCommercial farms and scaling growers who rely on consistent cycle times and repeatable results\u003c\/li\u003e\n\u003cli\u003eHigh-volume hobby growers who want access to wholesale pricing without complicated sourcing\u003c\/li\u003e\n\u003cli\u003eRetailers and resellers looking for a reliable, high-performing sterile CVG substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot a Bulk Buyer?\u003c\/h3\u003e\n\u003cp\u003eThis page is for \u003cstrong\u003etrade, wholesale, and high‑volume growers\u003c\/strong\u003e ordering \u003cstrong\u003e25–1000+ units\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you’re a \u003cstrong\u003ehobby grower\u003c\/strong\u003e or want to \u003cstrong\u003etrial smaller quantities first\u003c\/strong\u003e, use our standard (non‑bulk) listing \u003ca href=\"https:\/\/martian-mushrooms.com\/collections\/sterilised-substrate\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from the source\u003c\/strong\u003e - You get the best price. It's all about direct supply from a top UK mushroom supplier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale whenever you’re ready\u003c\/strong\u003e - Need 25 now or 1,000+ regularly? We’ve got you covered year-round.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh water-holding capacity\u003c\/strong\u003e - Master's Mix acts like a moisture reservoir, supporting fuller flushes and reducing the need to over-mist or fight drying.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean, commercial-grade sterility\u003c\/strong\u003e - Each batch is sterilised for 2.5 hours at 121°C in a computer-controlled autoclave at our Kent facility, giving you a contamination-free start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfectly balanced moisture\u003c\/strong\u003e - Master's Mix is hydrated just right to encourage healthy, vigorous growth without inviting bacteria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality filtration\u003c\/strong\u003e - 0.2-micron filter patches let the bags breathe while helping keep contaminants out - so you get more consistent results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat You Get\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk packs 25–1000 to match your production runs\u003c\/li\u003e\n\u003cli\u003eTwo bag weights: 2kg or 3kg to fit different SOPs\u003c\/li\u003e\n\u003cli\u003eOptimally hydrated hardwood, soyhulls and gypsum blend for rapid colonisation\u003c\/li\u003e\n\u003cli\u003eCleanroom-prepped and ready to inoculate on arrival\u003c\/li\u003e\n\u003cli\u003eSterilised in a computer-controlled autoclave (2.5 hrs @ 121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e (we stand behind every bag)\u003c\/li\u003e\n\u003cli\u003eFree UK delivery on £50+ orders helps protect margins\u003c\/li\u003e\n\u003cli\u003ePay in 3 interest-free instalments available at checkout\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt For\u003c\/h2\u003e\n\u003ch3\u003eProduct Sellers (retailers, resellers, garden centres)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilding a sterile Master's Mix line with repeatable quality\u003c\/li\u003e\n\u003cli\u003eOffering case quantities for serious growers\u003c\/li\u003e\n\u003cli\u003eImproving customer outcomes with a proven Master's Mix blend and guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGrowers (commercial \u0026amp; high-volume)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine spawn-to-bulk runs with clean, fully colonised grain spawn\u003c\/li\u003e\n\u003cli\u003eGrain-to-bulk workflows (monotubs and blocks)\u003c\/li\u003e\n\u003cli\u003eFaster SOPs: no soaking\/cooking\/sterilising on your end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpawning to bulk in tubs using Master's Mix substrate\u003c\/li\u003e\n\u003cli\u003eDialing in consistent surface conditions (hydration + airflow) to support strong, even colonisation and pinning\u003c\/li\u003e\n\u003cli\u003eRepeatable grow cycles when you want predictable bulk-run timing (varies by culture, spawn ratio, and environment)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2kg or 3kg sterilised Master's Mix substrate bag (per unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included: spore or liquid culture syringe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eSanitise your workspace and clean your tub\/tray.\u003c\/li\u003e\n\u003cli\u003eBreak up your fully colonised grain spawn in its bag\/jar so it mixes evenly.\u003c\/li\u003e\n\u003cli\u003eMix spawn with Master's Mix substrate in your tub\/tray until evenly distributed.\u003c\/li\u003e\n\u003cli\u003eLevel and lightly compress the surface to create a uniform top layer.\u003c\/li\u003e\n\u003cli\u003eIncubate until the bulk is fully colonised.\u003c\/li\u003e\n\u003cli\u003eIntroduce fruiting conditions once fully colonised (fresh air + surface humidity balance).\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eQuality Guarantee\u003c\/h2\u003e\n\u003cp\u003eAt Martian Mushrooms, we don't just sell supplies; we use them.\u003c\/p\u003e\n\u003cp\u003eEvery batch is produced with lab-first discipline: Master's Mix substrate is soaked\/cooked, hydrated to field capacity, and sterilised in a computer-controlled steam autoclave for 2.5 hours at 121°C.\u003c\/p\u003e\n\u003cp\u003eIf something goes wrong, you’re protected by our \u003ca href=\"https:\/\/martian-mushrooms.com\/products\/the-martian-lifetime-guarantee\"\u003eLifetime Guarantee\u003c\/a\u003e - built for growers who can’t afford downtime.\u003cbr\u003e\u003cbr\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBulk Sterilised Master's Mix Substrate Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaster's Mix blend\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHardwood, soyhulls and gypsum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag weight options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2kg \/ 3kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBulk pack sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 \/ 50 \/ 100 \/ 250 \/ 500 \/ 1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHydration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eField capacity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSterilisation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5 hrs @ 121°C (computer-controlled autoclave)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUse guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMix with colonised grain spawn\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTypical colonisation window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~3–4 weeks (culture\/conditions dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUse soon after arrival. Store at room temperature for up to 3-6 months. Refrigerate for up to 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree UK delivery on £50+ orders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2\u003eMartian Mushrooms vs. Competitors\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 137.157px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 32.5754%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 64.5675%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 32.5754%; height: 19.5938px;\"\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.5675%; height: 19.5938px;\"\u003e100% Premium Hardwood, Soyhulls and Gypsum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 32.5754%; height: 19.5938px;\"\u003e\u003cstrong\u003eSterilisation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.5675%; height: 19.5938px;\"\u003eIndustrial Autoclave (121°C @ 15psi+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 32.5754%; height: 19.5938px;\"\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.5675%; height: 19.5938px;\"\u003e0.2 Micron Gas Exchange Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 32.5754%; height: 19.5938px;\"\u003e\u003cstrong\u003eBag Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.5675%; height: 19.5938px;\"\u003ePolypropylene (Autoclavable, High-Temp)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 32.5754%; height: 19.5938px;\"\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.5675%; height: 19.5938px;\"\u003e3-12 Months (Store in a cool, dark place)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 32.5754%; height: 19.5938px;\"\u003e\u003cstrong\u003eManufacturing Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.5675%; height: 19.5938px;\"\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDon't let substrate prep slow you down. 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