The candy bombs can become an annoyance if they cannot be dealt with easily. However, four colours makes the task easier to bring down ingredients also.
To bring down the ingredients at the bottom end of the conveyor belt, you have to clear the candy just below the belt. If you miss it, the ingredient will go back at the top end of the belt, and you have to wait until it travels to the end again.
However, the ingredients come out pretty fast. It is not uncommon to witness 5 of them running on the belt.