The velcro backed electroplated diamond diamond polishing pads (sanding disc) offer the most aggressive removal rate you can imagine - they are much faster than an impregnated grinding disc because they have 100% diamond exposure.
These diamond polishing pads can be used wet or dry on a sander or grinder, and they operate well at any speed. The pads work on concrete, stone, tile, wood, swimming pool surfaces (the ONLY answer to quickly sanding PebbleTec), metals, even glass.
Use regular dry or wet diamond polishing pads to finish polishing.