What grout should I use on my Tile
Unlike what most people think, the grout is not part of the tile. The fact is grout is just a mixture used to fill the space between tiles during the installation process. When purchasing, you need to be sure that you are purchasing the right grout for your project. The type of grout to purchase entirely depends on the type of project you are working on. The task of adding grout to your tiles is much more complex that laying the tiles themselves. It is therefore crucial that you make sure you are informed about the type of grout to purchase fro your project. Discussed below are various types of grout valuable in the market.
Via: http://www.mytilebacksplash.com/best-type-of-grout-to-use.aspx