EMPLOYEE STATED: Was super sucking a rail car out and the hose clogged up. EE took the hose apart from the whip on the back of the truck to clear the clog. As EE was attaching the hose back to the truck, it puffed material into EE's face. EE was wearing proper eye protection, ie I force slim goggles. The employee went to the eye doctor and was prescribed a prescription.