Complete Refill Kit for Large 66Q Monotub - Ready-to-Use Substrate

In this review of the Complete Refill Kit for Large 66Q Monotub the bottom line is simple: it is designed for growers who already own the Grower's Select Large Monotub and want a convenient, ready-to-use set of materials to continue producing reliable flushes. The kit's single biggest selling point is that it combines two 5-grain spawn bags with 10 pounds of pre-mixed CVG bulk substrate and practical accessories, so most of the preparation work is removed. For those who value convenience and a near plug-and-play refill, this kit streamlines the refill process while keeping contamination risk lower than mixing everything from scratch.

Key Features

• Complete Large 66Q Monotub Refill Kit: Provides every major component needed to refill a Grower's Select Large Monotub so growers can resume production without sourcing separate parts.
• Two 5-Grain Spawn Bag: Comes with two grain spawn bags formulated to encourage robust mycelium expansion and to seed the bulk substrate efficiently.
• 10 Pounds of Select Bulk Substrate: The kit includes 10 lb of pre-mixed CVG substrate that is pasteurized and intended to promote vigorous colonization and simplify setup.
• 6 Monotub Filter Disks: Includes filter disks to help maintain ideal airflow and humidity while reducing contamination pathways during colonization and fruiting.
• Custom-Fit Black Monotub Liner: A liner sized for the large monotub helps retain moisture, promote even colonization, and makes cleanup and reuse simpler.

Who It's For

This kit is best for intermediate home cultivators who already own the Grower's Select Large Monotub and want a dependable refill solution without spending hours measuring and pasteurizing substrate. It suits growers who prefer consistent results and the time savings of pre-mixed CVG substrate and ready grain spawn.

It is less appropriate for complete beginners who want a full step-by-step learning package or for growers who demand full customization of substrate ratios and moisture levels; those users should consider sourcing individual substrate components and practicing pasteurization to gain hands-on control.

Pros & Cons

Pros

• Includes everything needed for a refill, reducing setup time and preparation steps.
• Pre-mixed, pasteurized CVG substrate helps encourage vigorous colonization out of the bag.
• Filter disks and a custom-fit liner help control airflow and moisture while lowering contamination risks.
• Two grain spawn bags provide adequate colonizing inoculum for the included bulk substrate.

Cons

• Some customers report mixed feedback on grain moisture; one noted the grain felt too dry for ideal propagation in their experience.
• The kit is tailored to the large 66Q monotub format and is not configurable for different container sizes.

Specifications

Product type	Complete refill kit for Large 66Q Monotub
Includes grain spawn	Two 5-grain spawn bags
Bulk substrate	10 pounds of pre-mixed CVG bulk substrate, pasteurized
Accessories	6 monotub filter disks and custom-fit black liner
Intended use	Refill for Grower's Select Large Monotub
Brand	Myco Labs

Our Verdict

The Complete Refill Kit for Large 66Q Monotub is a practical, time-saving choice for growers who want consistent refills without the hassle of mixing and pasteurizing substrate. It represents good value for monotub owners because it bundles spawn, bulk substrate, filter disks, and a liner; those who prefer full control over substrate moisture or use nonstandard tubs should consider alternatives.

Frequently Asked Questions

Will this kit work with other monotub sizes?
It is specifically configured for the Grower's Select Large 66Q monotub; compatibility with other sizes is not guaranteed and fit may be poor.

Is the bulk substrate ready to use out of the box?
Yes, the included CVG bulk substrate is pre-mixed and pasteurized to encourage colonization and reduce prep work.

How many filter disks are included and why?
The kit includes six monotub filter disks to help maintain airflow and humidity while reducing contamination risk during colonization and fruiting.