The PF-Tek is one of the most beginner-friendly methods for cultivating mushrooms at home. It uses a simple substrate mixture of brown rice flour, vermiculite, and water in a consistent 2:1:1 ratio by volume.
This calculator takes the guesswork out of preparing your jars by helping you scale the recipe based on the number and size of jars you’re using.
PF-Tek BRF Jar Calculator (2:1:1 Volume Ratio)
To create the mix you need to weight out the vermiculite first, then mix in the water and finally mix in the brown rice flour.