What is the reason for black fine particles in pure water of reverse osmosis membrane?

It is possible that the membrane was punctured, and the small black particles should also be granular activated carbon. I hope the answer will help you. As a well-known supplier of ultra-pure water equipment in China, Nanjing Quan Kun Biotechnology Co., Ltd. specializes in research and development, production and sales of ultra-pure water instruments, and provides complete solutions for ultra-pure water systems.