The walnut shells sold by Ningxia Biyuan Activated Carbon Co., Ltd. mainly develop and produce light-weight filter materials for the core shells of oily wastewater treatment. The raw materials are based on high-quality thick pecan shells, which are defatted, crushed, polished, thermophilized and screened for production. It is yellow-brown, has no rot, no spots, and has high toughness. Ningxia Biyuan Activated Carbon Co., Ltd. is a professional manufacturer and has about eight years of different filter media production and domestic historical trade. Now we are committed to developing our international trade. We adhere to the principle of "integrity management, quality service". Our employees are professional and sincere, and our prices are fair. Look forward to working with you.