Midwest's Select Bulk Substrate Casing Mix - 30 Pounds (BULK 6-PACK)
Midwest's Select Bulk Substrate Casing Mix - 30 Pounds (BULK 6-PACK) is backordered and will ship as soon as it is back in stock.
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Midwest's Select Bulk Substrate Casing Mix - 30 Pounds (BULK 6-...
Description
Description
Midwest’s Select Bulk Substrate Casing Mix – 30 lbs (6-Pack Bulk Bundle)
Wholesale Value • Ready-to-Use • Pasteurized • Built for Monotub & Bulk Grows
Scale your grows and save with our 30 pounds Select Bulk Substrate 6-Pack—six fully hydrated, pasteurized 5 lb bags designed for consistent, high-performance bulk growing. Perfect for monotubs, trays, and large batch setups, this bundle delivers the same trusted substrate used by tens of thousands of growers, now at a discounted bulk price.
Each bag arrives at ideal field capacity with a balanced pH and moisture profile, so you can go straight from fully colonized grain spawn to mixing and growing—no prep required.
Why Choose the 6-Pack Bulk Bundle?
- Save More When You Scale – Discounted bulk pricing vs. individual bags, perfect for frequent growers and larger setups.
- Optimized for Maximum Yield – Developed through extensive testing to support strong colonization, dense mycelium growth, and productive flushes.
- Ready-to-Use Convenience – Fully hydrated and pasteurized—no mixing, no measuring, no guesswork.
- Consistent, Repeatable Results – Uniform texture, moisture, and pH balance across every bag.
- Balanced pH & Mineral Support – Calcium-enhanced blend helps create ideal growing conditions while reducing contamination risk.
- Trusted by 50,000+ Growers – Over 100,000 bags sold since 2011.
What’s Included
- 6 × 5 lb bags of Select Bulk Substrate (30 lbs total)
- Pre-pasteurized & pre-hydrated to ideal field capacity
- Step-by-step Bulk Grow Guide (PDF) included
How Much Does It Cover?
This 30 lb bundle is ideal for multiple monotub grows or larger bulk setups. Use the chart below to dial in your ratios and maximize performance:
Quick rule of thumb: Most growers use a 2:1 to 3:1 substrate-to-grain ratio for fast colonization and consistent yields.
Recommended Use
- ~1 grain spawn bag per 5 lb substrate bag
- 2–3 grain jars (24–32 oz) per bag
- Ideal for monotubs, trays, and bulk containers
Premium Ingredients
- Coco coir + vermiculite for structure and moisture retention
- Hydrated lime & pH buffers for stable growing conditions
- Gypsum & mineral water to support mycelial growth
- Azomite Trace mineral blend for improved performance and consistency
Storage & Shelf Life
- Room temperature: Store sealed in a cool, dry place for up to 5–6 months
- Extended storage: Refrigerate for longer shelf life
- Avoid freezing and extreme temperature swings
Important Notes
This bulk bundle is already discounted. Coupon codes and promotional discounts do not apply. If you'd like to use a promo code on other items, please place this product in a separate order.
Let customers speak for us
I love the people and the products. The people at MWGK clearly care about the integrity of the community they serve.
The monotub works amazing only had it a couple of weeks and about to have second harvest I used AIO grow bag for first flush and move to tub for second and its great not having to watch 24/7. Thanks Midwest
Four days after mixing grain, Select substrate, and the Midwest horse manure booster - the results speak for themselves.
It has everything you need for a fast, large flush success with fewer moving parts than a standard monotub. It is a surprisingly versatile option for more advanced students. Pic is 5 grain jar at 8 days. GT LM This is where I shop, now.
Rich, perfectly field-wet, sterile and it is perfect for those many varieties that won’t thrive quite as well in Bulk Substrate and Casing Mix, which I’ve seen as best for psilocybes/cyanescens. I’m using it for the first time with Lions Mane and King Trumpets. So far so good, 7 days and primordial and pins are starting to flourish. It drains better and is lighter than MGK’s Bulk Casing and Substrate. Great product.
Love the heater and how even and exact it heats. I set mine to 76 degrees and my room fluctuates from 64-75 and it holds solid at 75 degrees. I used a probe thermometer to double check the substrate level temp and its exactly 1 degree less than the heater setting. Another tip, I only needed to use the round monotub thermometer to check my humidity levels every so often. I would leave a filter disk on that hole instead of the thermometer. The only time it came in handy was after my first flush when humidity started to drop. I was able to use that gauge and check whether I needed to mist. Overall great kit and worth the money!
Ive bought mutiple jars before i came up with my own recipe, every jar produced healthy cultures, even if ones damaged in shipping they replace immediately, highly recommend
Very small chance that you get a contaminate you already had it and you’re either culture spores etc. their stuff is 100% sterile every time 100% of the time everything is viable never had a problem been shopping with them for sometime
It’s very good product and I highly recommend it to everyone.👏👏👏
I love my magnetic stir plate it works great for Liquid culture jars.
My bag had a slow start, but excellent finish. Oak Ridge.
Great product for my cannabis best deal around arrived fast thank you Midwest grow kits definitely will be purchasing again
So far it seems very sturdy and I will give another review after I fill her up. Im just getting started with this life changing hobby and this will hold up strong
It was a price commitment, however it equated to less than I would spend on most any DIY project. I decided to purchase it and have since done spore work, agar transfers to agar and grain, culture to spawn bag inoculations, cloming and prints all with a 0% contamination rate. I practice about as good a sterile technique as I can mustard, considering I perform all my work on my kitchen table. Im consistently amazed by how flawless everything has turned out since adding this to my operations. I consider it indispensable. Instead of the double sided tape provided, i purchased some plastic velcro tape from the Gnome Depot and use it to affix the pvc guards to the sides. When i am done, i have also made it so i can sandwich them together and store them one the front to protect that precious filter when not in use. If you can swing it, buy it. Takes the risk out of procedure. Im bummed i cheaped out on the stainless riser offered at a discount with purchase of the LFH. That would have been exceedingly useful, but I have since utilized a baking drying rack to much success. Now go forth and frolic in the dung!
This is really built well, simple to operate, so happy to have some control of fruiting conditions finally.
