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Mushroom growing kit: 2 bulk substrate & casing mix bags, 2 grain spawn bags, and 6 white filter patches.
Mushroom cultivation: spore injection, mycelial growth, substrate mixing, fruiting, and harvest of golden mushrooms.
Mushroom growing kit: 2 bulk substrate & casing mix bags, 2 grain spawn bags, and 6 white filter patches.
Mushroom cultivation: spore injection, mycelial growth, substrate mixing, fruiting, and harvest of golden mushrooms.
Extra 10% Off

Midwest Grow Kits Complete Large 66Q Monotub Refill Kit

Price:
$79.99 USD
Or
Pay as little as
$7999/mo
for a term that suits you, up to 36 months. Learn More
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MODEL: RFL66
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Midwest Grow Kits Complete Large 66Q Monotub Refill Kit

Ready for your next cultivation cycle but don't want to buy a whole new setup? The Midwest Grow Kits Complete Large 66Q Monotub Refill Kit is the perfect solution for experienced growers. It provides all the essential, high-quality consumables you need to get your next grow started quickly and affordably, ensuring continuous cultivation without the extra expense.

This comprehensive package is designed as the ideal companion for the Complete Large 66Q Monotub Kit. It includes two premium 5-grain spawn bags, ready for inoculation with your favorite spore syringe or liquid culture. Once colonized, simply mix them with the 10 pounds of our pre-pasteurized Select Bulk Substrate, which is specially formulated to fuel vigorous mycelial growth and produce abundant yields.

To ensure an optimal growing environment, the kit also comes with six replacement monotub filter disks for perfect air exchange and a custom-fit black liner. The liner is crucial for retaining moisture, preventing side-pinning, and making post-harvest cleanup a breeze. By bundling these essential mushroom growing supplies, you save both time and money compared to purchasing each item separately.

What's Included

  • 2 x 5-Grain Spawn Bags (Pre-Sterilized)
  • 10 lbs Select Bulk Substrate (2 x 5lb Bags, Pre-Pasteurized)
  • 6 x Monotub Filter Disks
  • 1 x Custom-Fit Black Monotub Liner

Features

🌱
Dual Spawn System

Two sterilized 5-grain spawn bags provide double the colonization points for faster development and bigger yields.

🍄
Premium Bulk Substrate

Includes 10 lbs of nutrient-rich, pre-pasteurized substrate perfectly formulated for vigorous mycelial growth.

🌬️
Optimal Airflow & Protection

Six fresh filter disks maintain ideal gas exchange while protecting your grow from airborne contaminants.

✨
Easy Harvest & Cleanup

A custom-fit black liner prevents side-pinning, retains moisture, and makes post-harvest cleanup effortless.

Specifications

Specification Value
Compatible With Large 66Q Monotub
Spawn Bags 2 x 5-grain, pre-sterilized
Substrate Weight 10 pounds (two 5lb bags)
Substrate Type Pre-mixed, pasteurized Select Bulk
Filter Disks Included 6
Liner Type Custom-fit black monotub liner
Recommended Culture Amount 5cc per spawn bag (not included)

FAQs

Is this a complete kit for beginners?+

No, this is a refill kit designed for growers who already own a 66Q monotub. If you're just starting, we recommend the Complete Large 66Q Monotub Kit or exploring our full range of mushroom grow kits.

What do I need to provide myself?+

You will need your own 66Q monotub, a spore syringe or liquid culture (not included), and standard sanitizing supplies. This kit provides all the consumable growing media needed for a new cycle.

How much spore solution should I use?+

We recommend injecting 5cc of your preferred spore syringe or liquid culture into each of the two 5-grain spawn bags for optimal colonization.

How long does it take for the spawn bags to colonize?+

Colonization time can vary based on species and environmental conditions, but it typically takes 2-3 weeks in a warm, dark place before it's ready to be mixed with the substrate.

Is the substrate ready to use out of the box?+

Yes, the 10 pounds of Select Bulk Substrate comes pre-mixed and perfectly pasteurized, ready to be mixed with your fully colonized spawn.

Why is a liner important for a monotub?+

The included custom-fit liner helps maintain ideal moisture levels, prevents "side-pinning" (mushrooms growing between the substrate and the tub wall), and makes cleanup after your harvest significantly easier.

Shipping & Returns

Order Processing & Shipping

We currently ship within the United States only. No international shipping is available at this time.

Order Processing:

  • Most orders are processed within 24-48 hours after being placed.
  • Some products may have extended processing times of 7-14 business days or more, which will be clearly indicated on the product page. If your order includes such items, you will receive an email from our team or be contacted directly to confirm the estimated shipping timeframe.

Shipping Times:

We partner with reliable national carriers to deliver your orders. While specific delivery times can vary, here's a general timeframe for each carrier:

  • USPS: Typically delivers between 9:00 AM and 5:00 PM, Monday through Saturday.
  • FedEx: Typically delivers between 8:00 AM and 8:00 PM, Monday through Friday, with some Saturday deliveries.
  • UPS: Typically delivers between 9:00 AM and 7:00 PM, Monday through Friday, with some Saturday deliveries.

Note:

  • These are estimated delivery hours and may vary depending on your location and specific delivery circumstances.
  • For the most accurate delivery information, please refer to the tracking details provided once your order has shipped.

Free Shipping

Free shipping on qualified items to the lower 48 states. Some that are not eligible are stated on their respective product information page. Learn more

Refunds & Returns

Cancellations are accepted within 24 hours of placing an order.
Returns are subject to each manufacturer's return policy. Please look into the return policy of the brand prior to ordering. Learn more

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