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. Read my full guide on growing mushrooms with PF-tek here.