• Large monotub refill kit with 5lb bag of sterile milo grain and 5lb bag of Sterilized substrate
  • Close-up of barehands holding moist CVG substrate block, highlighting texture of coco‑coir, vermiculite, gypsum blend.
  • Shot of a 5 lb bag of not so simple substrate, mushroom substrate
  • 5-pound bag of sterile milo (sorghum) grain spawn in Unicorn bag with built-in injection port
1 4

Mycologysimplified

Large Monotub Refill Kit

Large Monotub Refill Kit

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$29.99
$29.99
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Large Monotub Refill Kit – Clean, Flexible, and Ready to Grow

Already have your tub and tools? The Large Monotub Refill Kit is a streamlined restock option for growers who just need the essentials: high-quality 5 lb sterile Milo grain and a 5 lb CVG substrate block. Vacuum-sealed and clean-handling, this kit is ideal for fruiting in a monotub or directly in the bag—no need to start from scratch.

What’s Included:

  • 5 lb Sterile Milo Grain Bag – Hydrated, sterilized, sealed with self-healing injection port and filter patch
  • 5 lb CVG Substrate Block – Pasteurized coir/vermiculite/gypsum mix at field capacity

Why You'll Love It:

  • Restock your setup fast—no extra tub, liner, or clutter
  • Grow your way: fruit in a monotub or right in the bag
  • Reliable results with vacuum-sealed freshness and pro-grade prep

Quick Start Guide

Step Instructions
1. Inoculate the Grain Clean injection port with 70% isopropyl alcohol. Inject 5–10 mL of liquid culture or spore solution. Shake gently to distribute.
2. Incubate the Grain Store at 70–75 °F in a clean, dark space. Once 20–30% colonized, gently mix to speed up growth. Allow 10–18 days for full colonization.
3. Mix with Substrate Combine colonized grain with the 5lb CVG substrate. You can mix inside a monotub or directly in the substrate bag for bag fruiting. Flatten surface gently.
4. Incubate Store the tub or bag at 70–75 °F in indirect light. Allow 5–10 days for full colonization.
5. Initiate Fruiting Introduce light and fresh air. Crack the lid (for tubs) or cut slits in the bag and cover with micropore tape for airflow if needed
6. Mist & Monitor Mist side walls  as needed to maintain humidity. Watch for pins in 5–7 days and adjust airflow for healthy fruiting.

Storage & Shelf Life

  • Store sealed between 45–70 °F until use
  • Best used within 30–45 days of receipt
  • Do not freeze. Refrigerate only fully colonized bags if needed

Disclaimer

For laboratory use only. Not intended for illegal use. All sales are final, but we’re happy to help with any concerns on a case-by-case basis.

Don't Forget Your

Replacement Monotub Filters

Apply to your fruiting chamber to give your substrate fresh air while maintaining high humidity levels.

Let customers speak for us

from 679 reviews
Drippy Corn Mushroom Grain Spawn
Jade

Havent used them yet, but the shipping was super fast (2 days). Looks great for my visual inspection

Drippy Corn Mushroom Grain Spawn
Drippy Corn Mushroom Grain Spawn
Chase

Double packaged arrived on time, will order more supplies from them

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Mark

Real good product

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Drippy Corn Mushroom Grain Spawn
Mark

Great product! You guys are great!

Drippy Corn Mushroom Grain Spawn
Erik Cole

They were complete professionals in every way. Went above and beyond. I would not go anywhere else. Why pay twice the price ? This picture does not do it justice but the grain bags are perfect !

Mycologysimplified
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Rick

I love everything about mycology simplified, they are completely on point

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Mark

Great quality

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Amazing product works bettet than expected easy to use and understand

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Everything looks great, speedy delivery.

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Everything was delivered as it looks on site, fast delivery.

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Richard

Looks good and delivery was fast

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Aaron

Legit products good price and selection

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David

very good

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David

very good

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David

Very good!

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