Drain Clear Australia uses mainly water jetting, a fast & efficient method of clearing a blocked sewer using a high pressure water jet at 5000 Psi. to cut roots, fats or grease. There isn't much that will stand in it's way.
While this jet of water will cut roots, it does not cut the pipe itself due to the angle of the jets, the smooth surface of the pipe, and the constant movement of the device itself.
Smaller blockages such as a blocked shower, kitchen sink or yard gully may simply need a chemical treatment and a good plunge. The best method to use usually isn't known until the situation is assessed on site.