My dad sold herbicide and sprayers for industry and agriculture. He had to take all kinds of classes to learn the proper applications, EPA rules, etc. I remember him telling me turning away farmers who wanted to do something shady with some of the more exotic stuff (meant for people trained for application). Because yeah, you put like stuff in a small pond to get rid of your algae meant for a lake or something and you manage to screw up a lot of other stuff you didn’t mean to. 
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