Colonization Time:
The main difference between whole grain and PF style jars is that whole grain
remains loose, and can be shaken, thus spreading the mycelium points and colonizing
faster.
PF Jars are solid and cannot be shaken.
Sterilization:
The PF-tek substrate can be sufficiently sterilized even without a pressure
cooker while whole grain virtually requires a pressure cooker to sterilize effectively.
(see also "fractional sterilization")
Inoculation:
Grain can be inoculated with with a syringe, agar wedges of grain to grain transfer,
while the PF-jars are limited to a syringe.
