170. A typical oily-water separator has three stages of separation. Which statement represents the correct sequential order of the stages?

Oily-water separators remove oil in stages, progressing from bulk separation to fine polishing. The correct sequence is gravimetric separation first, followed by an inclined plate coalescer, and concluding with a polishing filter coalescer. This order ensures efficient removal of oil, starting with gravity-based separation and culminating in a final filtration to meet regulatory discharge limits.