Team Magnation


Since 2008, Magnation Water Technologies has helped solve complex water challenges with innovative, environmentally sound and cost-effective products. With a constant emphasis on providing superior products, exemplary service and honest answers, the company has expanded globally with a strong network of distributors and loyal customers.

Magnation is passionate about water conservation through improved water productivity, reducing chemicals, and energy consumption with top-quality products made in the United States. Read our customer's experiences.


Magnation water treatment products serve a variety of industries around the world, supporting agriculture, golf and sports turfgrass, horticulture and landscape businesses by addressing issues including limited water supplies, unusable well water, unproductive soil, hard water, and mineral scale buildup. Our family of products also includes home water treatments and solutions that improve hydration for people and animals.

Magnation Water Technologies is located in the Bay Area near the Port of Oakland at 660 4th Street, Oakland, CA 94607

Our hours of operation are Monday - Friday from 8am -4pm PST.

Mike Jenzeh | Cofounder, President

In 2008, Mike Jenzeh co-founded Magnation Water Technologies with a single purpose in mind – to help farmers solve their complex water challenges with innovative, cost-effective technologies. With a constant emphasis on providing great products, exemplary service and honest answers, Mike has helped grow Magnation from a tiny, windowless office into one of the largest, most trusted names in commercial and residential irrigation solutions. Today, Magnation’s water-wise irrigation devices are heavily used on many major farms and sports arenas across the United States and internationally.

Prior to founding Magnation, Mike spent ten years in commercial real estate and seven years abroad manufacturing products for Nike, Apple, Macy’s and Cisco Systems.

He is a graduate of Roosevelt University with dual degrees in Philosophy & International Relations and an honorable veteran of the United States Army, 82nd Airborne Division, Fort Bragg, North Carolina.

Stef Jenzeh | Cofounder, VP Marketing

Driven by a love for learning, Stef Jenzeh comes from a background in advertising design with strengths in branding, graphic design and marketing. Mother of four children, co-founder and business owner of Magnation Water Technologies based in Oakland, California since 2008, Stef invests her time, passion and drive for a cleaner, healthier planet. Stef has led the charge in educating consumers about chemical-free water systems that promote not only water productivity, but also environmental health and safety.

Prior to taking the helm at Magnation Water Technologies in 2008, Stef owned her own graphic design and web development firm since 2000, and was a Wildland Firefighter for the US Department of Agriculture.

Andrei Bargaoanu | Operations

Although Andrei is chiefly responsible for bookeeping and customer service, it’s not uncommon to find him meeting new customers and demonstrating Magnation water treatment technologies at various tradeshows around the country. That’s because Andrei has years of experience in both geological reporting and technology sales. This unique professional background makes him ideally suited to understand soil concerns and present ways modern science can help solve some of those problems.

Andrei is a long-time resident of Northern California and holds a B.A. from of the University of California, Berkeley.


Mike Cohn

Mike Cohn | Business Development Manager

Born and raised in Oakland, and with over 40 years experience cheering the Oakland A's, few can match Mike Cohn's homegrown loyalty. And as a double bonus, his passion for talking sports and helping forward sustainable products that make economic sense.

With a background in economics, Mike has managed international shipping and logistics for the import/export industry, worked in software solutions and wireless networks in Silicon Valley, as well as eight years in corporate finance for the banking and leasing industry before joining Magnation in 2016.

He is a proud dad of two girls and still manages to hit almost every A’s game.


Roger Alphonso

Roger Alphonso | Production Manager

With integrity and mastery, Roger attests to every detail that Magnation's reputation is built on. Roger's capable and experienced touch assure every system ready to ship has met the highest standards of manufacturing. This former NCAA All-American soccer star born in Guyana knows what it takes to get the job done, and has been a part of the Magnation family since day one.

Aside from spending time with his family and playing on the pitch with his Northern California soccer team, Roger is an ardent traveler and holds a B.S. from of the University of San Francisco in Physics.


Jerry Todd | Outside Sales, Central California

Jerry has a rich background of experience in new and practical methods for stewardship related to the clean and economical application of water, energy and environmental technologies.

Cross discipline experience comes as an asset, as often problems solved in one field are applicable in others. Over the years of entrepreneurialship in the field of engineering, Jerry possesses a wealth of technology applications from developing water treatment (Ozone/UV) units, developing magnetic technologies many years ago with successful results in irrigation and swimming pool applications, to controlling scale formation via a catalyst methodology termed "Epitaxial Nucleation", to a patented vortex technology for cleaning the air and measuring the flow of gases such as hydrogen, to impressive bioremediation in oil spills, and even solving production problems with asthma inhalers in the pharmaceutical industry. Relative to Magnation's mission, Jerry's experience bolsters the focus of expertise and professionalism Magnation represents.

If you don't see Jerry romping around his native Central California locale in Bakersfield, you can find him at an International Center for Water Technology at Fresno State University event as he has been an active member since 1996. ICWT is a public-private partnership dedicated to the development and application of advanced technologies that enhance water use for urban, environmental and agricultural purposes.