Complete Refill Kit for Large 66Q Monotub - Includes Grain Spawn & Bulk Substrate

Name: Midwest Grow Kits Complete Refill Kit for Large 66Q Monotub - Includes Grain Spawn & Bulk Substrate - Complete Refill Kit for Large 66Q Monotub - Includes Grain Spawn & Bulk Substrate
Brand: Midwest Grow Kits
SKU: 45978230456469
Price: 59.99 USD
Availability: InStock
Rating: 4.6071 (22 reviews)

4.5 (1,234)

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Description

Complete Refill Kit for Large 66Q Monotub – Grain Spawn + Bulk Substrate
Keep Your Monotub Going Strong – No Need to Start from Scratch!
Reignite your growing cycle with the Complete Refill Kit for your Large 66-Quart Monotub—a cost-effective, all-in-one solution to keep your setup producing flush after flush. Whether you're on your secon...

Reviews

4.6

28 ratings

Returning customer

Midwest grow kits always gives me the best quality grain spawn bags and substrate. I have always been able to grow my mushrooms with ease. I will continue to purchase all my growing supplies from them.

Tony · July 2, 2026

The only place I get from!

I've ordered this refill many times now and plan on ordering it MANY many more! I have never had any problems with anything I've ever ordered from Midwest either. Field capacity is always fine as well! The ONLY thing I can think of that would make these even more cool, is if they offered a manure based substrate refill as well. That being said though I always get this for the ease of it all.

Chris · June 30, 2026

Refill Kit

Easy to order, fast shipping, Just what I needed.

SC · August 29, 2026

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Complete Refill Kit for Large 66Q Monotub - Includes Grain Spawn & Bulk Substrate

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Delivery & Returns

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