I believe this should be a process costing system as the company may make only Weed Terminator. But it could be job-order costing system if you consider the steam generating plant as the first part of the process which is separate and has other functions. Please explain.

Exercise 12-2B Identifying the appropriate costing system Tully Corporation's Kearney Plant in Jacksonville, Florida, produces the company's weed-control chemical solution, Weed Terminator. Production begins with pure water from a controlled stream to which the plant adds different chemicals in the production process. Finally, the plant bottles the resulting chemical solution. The process is highly automated, with different computer-controlled maneuvers and testing to ensure the quality of the end product. With only 15 employees, the plant can produce up to 6,000 bottles per day. Required Recommend the type of costing system (job-order, process, or hybrid) Kearney Plant should use. Explain your recommendation