Process Solutions Integration (PSI), a SunSource company, is the one source supplier for instrumentation & filtration products with the relationships, skills, and infrastructure to deliver the products and services for all of your applications. www.psi-technology.com Process Solutions Integration (PSI), a SunSource company, is seeking an individual with knowledge and experience in the process filtration industry. The ideal candidate will have knowledge of refinery and natural gas processing plants and how filtration plays a very important role in the operation of those process systems, as well as knowledge of those filtration products.