Just my opinion, but I have worked operationally with installing filter packages. Lean filtration seems to work best, using Carbon and filters. Although I was involved with installing a EDU skid, and it worked very well in controlling heat stable salts. It costs money upfront, but it will pay for itself eventually. Here is a website you might want to check out. http://www.electrosep.com/
…I have also heard Refiners wanting to move more toward filtering Rich amine…which is helpful, but their is a need to assure Process Safety Management issues are resolved.