Grout is a type of soil that helps to hold together the surface of a building or floor. It’s made up of small pieces of rock, clay, and other materials that have been combined together to make a thick paste. When it rains, water seeps into the grout and starts to break down the clays and release their nutrients. This process creates an environment that is rich in bacteria, which helps to clean the grout and remove any built-up dirt and debris.
