You should never dispose of construction debris down the drain, no matter its source. This includes both powdery substances and tiny particles. While larger pieces can lead to clogs, smaller bits can adhere to the walls of the drain, causing even more significant problems over time.
To maintain a clear and functional plumbing system, always dispose of building waste properly in designated containers. Taking this precaution can help prevent costly plumbing issues and ensure that your drainage system remains in good working order.