Alex-Tronix Filter Backwash Controls In 1977, Alex-Tronix opened its doors for the farmers of the Central San Joaquin Valley with a mission to save water and energy. We were the first manufacturer to reliably automate agricultural filter backwash systems. Today, OEM (Original Equipment Manufacturers) and dealers sell our controls in every region of the world, so you can find our high quality products wherever you need them. Made in America, we pride ourselves on manufacturing simple to program, reliable controls for your agricultural, industrial, or commercial water filtration needs. With the best service in the industry, Alex-Tronix has set the standard for filter backwash automation, innovation, and customer satisfaction in the world today.