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Re-hydrating your CVG Bulk Casing Substrate

bulk substrate kit 12lbs microwave sterilize at home.

This guide will walk you through making hot n’ fresh CVG casing substrate the way grandma used to.

What you will need:

1 bag Mushyluv microwave substrate
8 cups of water
1 food grade gypsum powder supplement.

Hydrationempty milk jug used to add water to mushyluv microwave substrate.

We’ve found it easiest to measure out 8 cups of water into an old milk jug (or equivalent sized pitcher) and mark the level for future reference.  Add the gypsum powder supplement to your water and shake (or stir) mixing thoroughly.  Pour this mixture into the microwave substrate bag.


Let your bag(s) sit for the next 30 min to 1 hour.  This gives the coco/vermiculite mix time to more evenly absorb the water.  You’ll notice the coco expanding as it absorbs moisture.

While you’re waiting check out our bulk spawn and casing tek.

After about an hour begin kneading your substrate bag. Really get in there and work out those knots. Break up any chunks you run across. Mix it like you stole it. And remember a relaxed substrate is a happy substrate.


Line up the top of the substrate bag tucking in its gussets evenly all the way down on both sides.  This will remove all the air from the bag.  Roll the top of the bag forward around the substrate leaving the (unsealed) top under the substrate.

Note: Only microwave one substrate bag at a time.

Place the freshly wrapped substrate bag on a plate and microwave for 20 mins on high.

What does freshly pasteurized substrate smell like to you? Leave a comment below.

When your bag is done, it’ll be like a tiny little Chernobyl.  Be careful moving the very hot bag.  Always use oven mitts or similar hand protection.  If you’re unsure if it’s too hot to move then give it another hour.

Cool down time will take 4 or 5 hours.  You want the substrate to be room temperature or below. We’ve let pasteurized bags sit for several days in cool down without any issue of contamination. Mushroom bags can be saved and used on future projects.




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