Recent Problem.
 

I just purchased an FD alt with the FC pulley. I installed it on my car and a few days later i noticed i had black dust on my water pump and it seems to be from the belt. The alt wasnt doing that on the car it was on and my S4 wasnt doing it either. When i put the alt i replaced the water pump too do to moisture around one of the bolts. Can anyone share some light on this?