Bulk Substrate Instructions

Bulk Substrate Preparation Guide

You'll Need:

Olympus Myco Bulk Substrate Kit:
1000g Coco Coir
475g Vermiculite
235g Gypsum

16 cups (4 quarts) Boiling Water
5-gallon Bucket with Lid
70% Isopropyl Alcohol


Step 1: Sanitize Bucket and Lid

Thoroughly sanitize the 5-gallon bucket and lid using 70% isopropyl alcohol. 

Step 2: Combine Dry Ingredients

In the 5 gallon bucket, mix coco coir, vermiculite, and gypsum together. 

Step 3: Boil Water

Heat 16 cups (4 quarts) of water until it reaches boiling point.

Step 4: Pasteurization and Hydration

Carefully pour the boiling water over the dry ingredients in the bucket. Cover with lid and let it sit for 90 minutes. This allows the mixture to pasteurize and hydrate.

Step 5: Mix

After 90 minutes, remove the lid and mix the substrate thoroughly. This helps distribute moisture and ingredients evenly.

Step 6: Cool 

Allow the substrate to cool down to room temperature. Once cooled, it's ready for use.

Step 7: Incorporate with Grain Spawn

For best results, introduce the substrate into a 56-66qt monotub. Add 5-6lbs of colonized grain spawn to initiate the growth process.