I would hope that the producer is designed to keep producing while to operator can take on other tasks, like selling product. I would hate to think that each time a customer came to a distributor the operation must be shut down to wait on the customer.
I suppose a big part of the business would be having the tanks to hold bulk capacity permitting production of liquid while tending to other matters. The key is maintaining the quality of each batch of fluid, hopefully it doesn't require constant attendance while it's running.