CNI Commercial, industrial filtration and separation systems manufacturer, to invest in Filtra Systems, manufacturer of custom industrial filtration and separation systems. Financial terms were not disclosed. Financial terms were not disclosed. “Filtra has built a tremendous business that shares CNI’s core values and advances our efforts to provide high-quality, custom-engineered products to our customers. The Filtra management team and their employees have developed some of the best technology for environmentally-friendly wastewater filtration, which is an important concern for the people of Oklahoma and beyond.” David Nimmo CNI Commercial CEO.