Is this suitable enough to use as the actual grow medium? Would I still need the substrate (rye berry, etc)

You will need to combine this with colonized grain spawn. It will not support colonization on its own.

What would the mixing measurements for a small batch?.. Say ..only needing a lb or 2 at a time..

I read that you can make a full batch and leave it for up to 6 months before using it all, so if you're going to be growing more batches in the near future, I'd probably just make the whole thing. Otherwise, you can measure out 1/5 of each of the three ingredients. The gypsum is the hardest to measure, but nothing needs to be exact, so I wouldn't worry too much. The big thing is to start with much less water than they say, like 12-14 cups. Now, they might be telling you that so you have enough boiling water to more thoroughly pasteurize the substrate, but if you use that much, you'll have to use a colander and/or manual squeezing and draining to get rid of the excess moisture. If you don't know what "Field Capacity" means, you need to do more research!

How do I use this with a 32oz jar of colonized substrate?

Boil water.... Drop all that stuff into a bucket or large pot an stir it up, add the heated water, seal it (i used plastic wrap ....but if you have a bucket with a lid use that) let sit for hours till its cool or at leased a little warm // ....now your ready to break out the monotub etc. Youtube 'Monotub and substrate' P.s. dont use as much water as this pack says....mine had Way to much water, had to squeeze it out by hand, still to much....

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🍄 Grow like a pro—fresh substrate, massive yields, zero hassle!

EFFORTLESS SETUP - Just add water and follow our simple guide—no fuss, no guesswork.
FRESHNESS ON DEMAND - Prepare your substrate fresh whenever you want—no stale mixes here.
MAXIMIZE YOUR HARVEST - Generate a hefty 10 pounds of nutrient-rich substrate for superior mushroom growth.
PRECISION ENGINEERED BLEND - Coco coir, vermiculite, and gypsum perfectly balanced for robust mycelium expansion.
VERSATILE CULTIVATION READY - Works seamlessly with monotubs, grow bags, and all your favorite setups.

Surfin' Spores Dry Mushroom Substrate Mix delivers 10 pounds of premium, pasteurized bulk substrate made from a precise blend of coco coir, vermiculite, and gypsum. Designed for optimal moisture retention and nutrient balance, this dry mix stays fresh until you're ready to prepare it, ensuring superior mushroom growth. Compatible with all common cultivation methods, it simplifies your grow process with just water and minimal equipment.

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Package Dimensions	30.4 x 29.21 x 15.7 cm; 1.45 kg
Material type	Coco Coir, Vermiculite, Gypsum
Item volume	4.52 Liters
Manufacturer	Surfin' Spores
ASIN	B09QXVR5GF

Surfin' SporesDry Mushroom Substrate Mix | Produces 10 Pounds of Pasteurized Bulk Substrate | CVG Blend (Coco Coir, Vermiculite, Gypsum)

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