Produced water treatment (PWT) continues to be a challenge. New technologies continue to be discovered to both treat produced water and do it in a way that creates an expectation to meet overboard discharge requirements. In addition, it is incumbent on engineers to reduce the overall footprint of the treatment system. The challenge is always to make the system more compact but also to ensure meeting water quality throughout the lifetime of the platform. Simple, vertical and compact are all words to describe the new technologies but longevity of treatment as the water cut increases is always the question. Are we choosing technologies with maximum oil and grease removal in mind or are we basing our equipment decisions with a bias on space requirements only? We hope to make a comparison of past present and future technology to find an answer.