Artificial grass infill is used between grass blades for lawns that aren't real or artificial. Infill is spread down into the turf fibers to help the blades of grass stand up so they don't have a flat appearance. It also protects the grass backing from ultraviolet rays which could eventually cause damage and void warrantys. Some artificial grass infill options are silica sand, or rubber. ZeoFill can be installed below or on top of all these infill options to help control the odors.