Carts shouldn't clog if you use them for their purpose as a daily shaver. Apart from some cheap versions all modern carts are open through. I assumed that as an injector can go through anything that a injector II would also. As with carts, they are obviously not designed for a weeks growth. Although the Caliber5 did that very easily.Okay, yes, I used to experience clogging when I used BIC disposables to shave around my beard. I would think clogging a major problem with cartridges although I've never used or owned one.