Need to relevel floor. How do I do this?

[aerobar900]

Ok so I have removed all the tiles on the laundry and toilet floor in my house. Some of the tiles still had some of the concrete slab attached to them when they were removed so I need to level my floor out before ne tiles are put down.
Any advice on how to do this?

Thanks

[DvdHntr]

There was another thread on this site about an uneven floor and using a grinder.

Here it is: http://www.woodworkforums.com/showthread.php?t=61556