First off, because this is a grey area industry, I recommend that you follow the laws that are in place in your place of jurisdiction. I am not legally liable for your actions.
Also, on this blog I have shown links to Amazon where you can buy the equipment. I am part of their Amazon Associates program so I am required to add the disclaimer below:
GrowLikeMe.xyz is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com or myhabit.com.