An important part of the HempNotics extraction process is harvesting pure, high-quality CBD oil through the Winterization process. This is the process to remove undesirable substances from the oil, so you wind up with pure THC-Free CBD. It is important to note that this is a part of harvesting CBD isolate, not full-spectrum CBD, which keeps those substances in it.
Once you have the oil extracted, you combine it with 200-proof alcohol and freeze it overnight. In the morning, it will be ready to run through a filter, which can remove the fats and other such materials. When the oil is of the quality you want, you can heat the mixture to the boiling point of alcohol (which is lower than that of CBD oil) and boil off the alcohol.