AN EMPLOYEE WAS WORKING ON THE SHAKER SCREEN AT CHEMOURS. EE WAS ASSISTING IN THE WASH DOWN AREA. THE FIRE HOSE HAD NO VALVE ON THE END TO REGULATE. WHEN EE GRABBED THE HOSE THE OPERATOR OF THE FIRE TRUCK TURNED WATER ON FULL FORCE. THE FORCE OF THE WATER COMING THROUGH THE HOSE KNOCKED EE OFF BALANCE, MAKING EE FALL BACKWARDS HITTING THE BACK OF HEAD ON THE TOE BOARD.