Harn R/O Systems is the oldest, privately-owned company in the membrane treatment industry. Since 1972 customers have turned to Harn to deliver the highest quality membrane treatment systems for their specific needs. Whether its a full on design/build, a membrane plant retrofit or a specific service or equipment need, Harn R/O has the knowledge, experience, and dedication to exceed your expectations. We dont view your plant as just equipment. We view it as the start of a long-term partnership. Our goal is to provide you with significant operational and cost savings. Through teamwork, added value, technical and operational expertise, and an ongoing commitment to service, that's what we deliver every time. We view each system from a process standpoint, not just another project. Everyone involved - the owner, the engineers, and Harn - shares an equal stake in success. As the industry leader, Harn R/O Systems draws on its vast knowledge of water treatment plants large, small and in-between to bring unparalleled quality and innovation to every project. We work faster, smarter and better simply because we have over 40 years of experience in every step of the process. And we work with you over the long-term to maximize your operational and cost efficiencies. Trust, quality, innovation and service . . . it's the promise we deliver to every owner. If you are a membrane treatment engineer, owner, or are interested in membrane treatment, Harn has the experience and resources to support you.