This article presents the top 10 ferrous sulfate manufacturers in China, highlighting Foshan Brilliance Chemical Co., Ltd. as the leader with a broad product portfolio and strong OEM capabilities. It covers other key players such as Sichuan Bailong Biotechnology and Chemland Group, detailing their production capacities, certifications, and market reach. The article also includes FAQs addressing common questions about ferrous sulfate applications, quality standards, and manufacturing capabilities.