SJE-Rhombus®, founded in 1975 and headquartered in Detroit Lakes, Minnesota, USA, operates more than 15 manufacturing facilities  in three countries. We provide a wide range of control products for the residential, commercial, municipal, and industrial water and wastewater treatment markets. For over 50 years of purpose-driven innovation，SJE holds over 65 design and utility patents, and our products and services have earned widespread trust and acclaim from customers. We are a global industry leader in control systems,with trusted partnerships established with customers worldwide.

SJE Rhombus (Suzhou) Co., Ltd. is founded in 2007. 100% owned by SJE INC. The company is located in Suzhou Industrial Park. We produce high-quality liquid level switches, control panels, alarms and other products, to serve the global water industry customers.

Our products are certified by UL, cUL, CSA, CE, and TUV, and our control panels comply with UL508A and UL698A standards in the U.S., as well as the EN61439, EN / IEC60730 standard and RoHS Directive in the EU. The commitment of high quality products and quality assurance services has won the trust and long-term cooperation of industry customers worldwide.