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    Monotub Refill Kit

    $46.00
    $40.00
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    Monotub Refill Kit – Substrate & Grain for Dung-Loving Mushroom Grows

    Already have your monotub dialed in? The Redwood Mushroom Supply Monotub Refill Kit includes everything you need to run another grow—just add spores or liquid culture. Designed as a perfect follow-up to our full monotub kit, this refill pack includes two bags of sterilized monotub mix and one bag of sterilized grain spawn, prepped and packaged for a clean, high-yield bulk grow.

    Why Choose the Monotub Refill Kit?

    🔁 Perfect for Reusing Your Setup – Designed for 64-quart monotubs and similar bin-style chambers.

    🧪 Lab-Prepared & Pre-Sterilized – Grain and substrate bags come ready to inoculate.

    🍄 Built for Dung-Loving Species – Great for monotub strains that thrive on nutrient-rich coir substrates.

    💼 No Frills, Just the Essentials – Everything you need to reload and grow another round.

    📦 Trusted Redwood Quality – Prepared in-house with care and consistency.

    Substrate: Monotub Mix

    Grain: Sterilized Sorghum

    Species: Suitable for dung-loving mushrooms


    Tub Size Compatibility: up to 64-quart

    Product Details

    Optimized for Bulk Fruiting

    This refill pack is ideal for growers who already have their monotub, filters, and liners in place. Each set of bags is portioned for a standard 64-quart tub or similarly sized fruiting bin.

    Premium Grain and Monotub Mix Substrate

    Prepared in-house in our lab, our sterilized sorghum grain provides the best possible starting point for your cultures. When added to our Monotub Mix (CVG fortified with worm castings), the result is rapid colonization and heavy yields!

    Inoculate. Colonize. Combine.

    Start by inoculating the grain bag with spores or liquid culture. Once colonized, mix it with your substrate directly in your lined tub, apply filters, and let your grow run. These bags are pre-sterilized and sealed to support a clean, efficient colonization phase.

    Instructions

    How to Use

    Inoculate the sterilized grain bag with your spores or liquid culture. Once fully colonized, mix with the monotub mix inside your lined tub. Apply fresh filters to the airflow holes (if replacing), maintain surface moisture, and monitor environmental conditions through colonization and fruiting.

    Specifications

    Substrate: Monotub Mix (Coir, Vermiculite, Gypsum), 2 × 5 lb bags

    Grain: Sterilized Sorghum, 3 lb with Injection Port & Filter Patch

    Species: Suitable for dung-loving mushrooms (user provides spores or LC)

    Tub Size Compatibility: 64-quart and similarly sized monotubs

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    Monotub Refill Kit

    $46.00
    $40.00

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