Royce Wood recommend good quality grouts that contain the Microban product which provides continuous antibacterial and antifungal protection. This helps stop mildew and other mould buildup and so keeps your grout and tiles in top condition. Examples of good quality grouts come from companies such as BAL and Mapei.
A good quality grout will not only come in many different colours to complement your Royce Wood tiles it will also give a superior smooth finish that is consistent in colour.
Always check with you tile installer as to what grout they are going to use. A little bit more spent on the right products can make a huge difference in the look and maintenance of the product in the future. I