When you need to grout a ceramic tile floor, you need to make sure that you choose the proper type of grout for the job. Your two options are sanded or unsanded grout. When installing tile on the floor, you should most likely use sanded grout. The sand in the grout adds a lot of toughness to it which will be necessary when you are walking on the floor. Unsanded grout is generally reserved for wall tile. This type of grout is ideal for very thin grout lines between the tiles, but not on floors.