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According to the Merriam-Webster dictionary:
A thin mortar used for filling spaces (as the joints in masonry or ceramic tile); also: any of various other materials (as a mixture of cement and water or chemicals that solidify) used for a similar purpose. A building material (as a mixture of cement, lime, or gypsum plaster with sand and water) that hardens and is used in masonry or ceramic tile.
Research shows Sanded grout is a porous and extremely fragile material used between ceramic tiles for esthetics, not strength. Ceramic tiles are actually held in place by “Thin-Set,” a masonry based adhesive, used under the tile to form a bond with the surface the tile is to be affixed. Sanded grout is applied hours or days after the ceramic tiles are solidly bonded to the surface below, which causes a cold joint between the newly applied grout and the previously hardened thin-set. Sanded grout is held in place as much by gravity as adhesion to the thin-set below and the edges of the ceramic tile. High-pressure surface cleaning will actually loosen and remove the sand in the grout. Should the pressurized cleaning process use enough pressure to get fluid to the cold joint, less than 3/8 of an inch below the grout surface, it is likely the entire grout joint will loosen and blow out much like a high wind getting under the edge of a roof and blowing the entire roof off a house. Therefore, high-pressure (200+ p.s.i.) cleaning and/or rinsing can do nothing but loosen and eventually remove sanded grout.
See our cleaning process that does not harm your expensive tile floor!
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