---
product_id: 541857942
title: "Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Inflatable Monotub"
brand: "boomer shroomer"
price: "€ 111.48"
currency: EUR
in_stock: true
reviews_count: 6
category: "Boomer Shroomer"
url: https://www.desertcart.hr/products/541857942-boomer-shroomer-dry-bulk-substrate-for-mushroom-cultivation-coco-coir
store_origin: HR
region: Croatia
---

# 1100g premium substrate blend Enough for 2 inflatable monotubs 16 cups boiling water pasteurization Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Inflatable Monotub

**Brand:** boomer shroomer
**Price:** € 111.48
**Availability:** ✅ In Stock

## Summary

> 🍄 Cultivate your own magic—bulk substrate made simple and scalable!

## Quick Answers

- **What is this?** Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Inflatable Monotub by boomer shroomer
- **How much does it cost?** € 111.48 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/541857942-boomer-shroomer-dry-bulk-substrate-for-mushroom-cultivation-coco-coir)

## Best For

- boomer shroomer enthusiasts

## Why This Product

- Trusted boomer shroomer brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted by Growers:** 4.7-star rating from 262 reviews proves consistent, reliable results for home cultivators.
- • **Beginner-Friendly Setup:** Clear step 3 in the Boomer Shroomer guide with minimal equipment—5-gallon bucket and boiling water.
- • **Generous Yield Capacity:** Produces around 9-10 pounds of substrate—enough to fuel two full Boomer Shroomer Inflatable Monotubs.
- • **Optimized Ingredient Trio:** 500g Coco Coir, 500g Vermiculite, and 100g Gypsum for ideal moisture & aeration balance.
- • **Ready-to-Activate Bulk Blend:** Just add boiling water and pasteurize overnight for effortless mushroom cultivation.

## Overview

Boomer Shroomer Dry Bulk Substrate is a premium, ready-to-pasteurize blend of 500g Coco Coir, 500g Vermiculite, and 100g Gypsum designed for home mushroom cultivation. Just add 16 cups of boiling water in a 5-gallon bucket, pasteurize overnight, and you get approximately 9-10 pounds of nutrient-rich substrate—enough for two inflatable monotubs. Perfect for beginners and seasoned growers alike, this substrate mix ensures optimal moisture retention and aeration, backed by a 4.7-star rating from over 260 happy cultivators.

## Description

Product description These dry ingredients are to make one batch of bulk substrate for your home grown mushroom grow (Step 3 on the Boomer Shroomer Beginner Mushroom Guide). All you need is a 5 gallon bucket with a lid and 16 cups of boiling water. Included is 500 grams of Coco Coir, 500 grams of Vermiculite, and 100 grams of Gypsum. Bulk Substrate Ingredients: 500 grams Coco Coir 500 grams Vermiculite 100 grams of Gypsum Needed At Home: 16 Cups Boiling Water 5-gallon bucket with lid First add the coco coir, vermiculite and gypsum to the 5-gallon bucket. Next, boil 16 cups of water. Once the water come to a complete boil, carefully pour into the 5-gallon bucket and then close the lid. Let it sit to pasteurize. After approximately 24 hours it is ready to use. Ideally keep insulated to aid the pasteurization process. Once it has cooled down, double check to make sure it is at field capacity and mix in with your colonized grain spawn. Safety Warning Note: Please use hand protection devices when adding boiling water. Avoid inhaling the ingredients.

Review: Love the stuff - Best dried sub if you know what your doing
Review: This is an excellent substrate that 100% works. Sanitize and Sanitize again! :) - Excellent quality substrate mix. The price is also more than reasonable. I was able to make out 2 monotubs and 6 shoe boxes with what I got from this kit and still have a least a quart left over. Heat or pressure sterilization before you use this substrate or any online bought substrate is critical. This simply mean you have to mix the substrate mixture with boiling water or pressure cook it. Also it can't be just kind of hot or luke-warm. The water has to be at a rolling boil when you pick it up to dump it in. I have used two methods the first is the easiest: I put my substrate mix in a generic hardware store bucket (make sure when you get one you include a sealing lid preferably with a rubber gasket! Hit it with iso when you get it home for good measure!) from there you put whatever ammount of boiling water; you have decided to use I honestly kind of wing it every time. I just make sure that the ammout of water I add is sufficient to cover the mix. Then once boiled-water is poured in put the lid on the bucket (yes the plastic will be hot and the lid will swell) the heat that is trapped in the bucket with the substrate will kill off all the microbes, bacteria, mold, mildew, etc. you have to let it sit for at least 8 hours in my experience if you try mixing your grainspawn with this super heated substrate the small ammount of still escaping steam will cook your mycelium alive like an omlet so don't rush it (it's also really easy to misjudge how hot the substrate is then burning your hand when reaching in to grab some, so be careful!) The second method just replaces the bucket with a large gasketed cooler with toggle locks. I just figured out that I can microwave the substrate to purify it as well so I got a large cheapo microwave off FB market and I use it only for sterilizing substrate and genetics saving equipment like glass petri dishes. It should be well thought out that this isnt a one time sanitize all thing - you can develop a contaminated substrate in your bucket while waiting to use it for another tub weeks later. That's where the microwave came in for me now I can dole out as much as I want and steam it clean in the microwave. So far I havent had any contams. I have how ever had some serious success! Thanks my myco peeps and I hope this helps someone.

## Features

- Bulk Substrate Ingredients: 500 grams Coco Coir, 500 grams Vermiculite, and 100 grams of Gypsum
- Just add 16 cups of boiling water and let pasteurize overnight.
- Makes around 9 pounds of bulk substrate. Makes enough for two Boomer Shroomer Inflatable Monotubs.
- Any questions or concerns please contact Ashley at ashley@boomershroomer.com

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C21QDHXX |
| Best Sellers Rank | 310,815 in Garden ( See Top 100 in Garden ) 2,008 in Gardening Soils |
| Brand | Boomer Shroomer |
| Brand Name | Boomer Shroomer |
| Customer Reviews | 4.7 out of 5 stars 273 Reviews |
| Global Trade Identification Number | 00196852195749 |
| Item Type Name | Bulk Substrate |
| Item Weight | 1.15 Kilograms |
| Item weight | 1.15 Kilograms |
| Manufacturer | Boomer Shroomer |
| Manufacturer Part Number | BSBULK001 |
| Model Number | BSBULK001 |
| Number of Packs | 2 |
| Style | Coco Coir , Vermiculite |
| Style Name | Coco Coir,Vermiculite |
| UPC | 196852195749 |
| Unit Count | 4731.76 millilitre |
| Volume | 5 Gallons |

## Product Details

- **Brand:** Boomer Shroomer
- **Global Trade Identification Number:** 00196852195749
- **Style:** Coco Coir,Vermiculite
- **UPC:** 196852195749

## Images

![Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Inflatable Monotub - Image 1](https://m.media-amazon.com/images/I/71-0PHHRPPL.jpg)
![Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Inflatable Monotub - Image 2](https://m.media-amazon.com/images/I/81jzdffu7UL.jpg)
![Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Inflatable Monotub - Image 3](https://m.media-amazon.com/images/I/81UXriaHxvL.jpg)
![Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Inflatable Monotub - Image 4](https://m.media-amazon.com/images/I/71Y6FoKQBDL.jpg)
![Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Inflatable Monotub - Image 5](https://m.media-amazon.com/images/I/717C-RJjfYL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Love the stuff
*by C***S on 27 May 2026*

Best dried sub if you know what your doing

### ⭐⭐⭐⭐⭐ This is an excellent substrate that 100% works. Sanitize and Sanitize again! :)
*by M***N on 1 February 2025*

Excellent quality substrate mix. The price is also more than reasonable. I was able to make out 2 monotubs and 6 shoe boxes with what I got from this kit and still have a least a quart left over. Heat or pressure sterilization before you use this substrate or any online bought substrate is critical. This simply mean you have to mix the substrate mixture with boiling water or pressure cook it. Also it can't be just kind of hot or luke-warm. The water has to be at a rolling boil when you pick it up to dump it in. I have used two methods the first is the easiest: I put my substrate mix in a generic hardware store bucket (make sure when you get one you include a sealing lid preferably with a rubber gasket! Hit it with iso when you get it home for good measure!) from there you put whatever ammount of boiling water; you have decided to use I honestly kind of wing it every time. I just make sure that the ammout of water I add is sufficient to cover the mix. Then once boiled-water is poured in put the lid on the bucket (yes the plastic will be hot and the lid will swell) the heat that is trapped in the bucket with the substrate will kill off all the microbes, bacteria, mold, mildew, etc. you have to let it sit for at least 8 hours in my experience if you try mixing your grainspawn with this super heated substrate the small ammount of still escaping steam will cook your mycelium alive like an omlet so don't rush it (it's also really easy to misjudge how hot the substrate is then burning your hand when reaching in to grab some, so be careful!) The second method just replaces the bucket with a large gasketed cooler with toggle locks. I just figured out that I can microwave the substrate to purify it as well so I got a large cheapo microwave off FB market and I use it only for sterilizing substrate and genetics saving equipment like glass petri dishes. It should be well thought out that this isnt a one time sanitize all thing - you can develop a contaminated substrate in your bucket while waiting to use it for another tub weeks later. That's where the microwave came in for me now I can dole out as much as I want and steam it clean in the microwave. So far I havent had any contams. I have how ever had some serious success! Thanks my myco peeps and I hope this helps someone.

### ⭐⭐⭐⭐⭐ 5 stars
*by J***S on 12 April 2026*

Amazing substrate! Contaminate free and reliable every time!

## Frequently Bought Together

- Boomer Shroomer Dry Bulk Substrate for Mushroom Cultivation (Coco Coir, Vermiculite, Gypsum) | Produces 10 Pounds of Pasteurized Substrate, Enough for Two Boomer Shroomer Inflatable Monotub
- Boomer Shroomer Inflatable Monotub Kit, Mushroom Growing Kit Includes a Drain Port, Plugs & Filters, Removeable Liner [Patent No: US 11,871,706 B2]
- Myco Labs Premium 5-Grain Mushroom Spawn Bags | Sterilized Grain Spawn | Injection Ports | 2 Quarts Each Bag | 2 Bags per Box

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-06-06*