RDT spray to reduce static electricity while grinding coffee. The RDT coffee bean spray is a practical and effective tool to... RDT spray to reduce static electricity while grinding coffee. The RDT coffee bean spray is a practical and effective tool to reduce static electricity during grinding, which helps keep your grinder clean and cut down on waste. It works by spraying a small, balanced amount of water onto the beans before grinding to improve performance and achieve a cleaner, more consistent extraction. It features an air discharge pump that produces a fine, even mist, and can be used from different angles, including upside down. Made from high-quality polypropylene plastic with a sleek matte black finish, it's perfect for both coffee enthusiasts and pros. Available in a 30 ml size.