Synthetic grass tennis courts require regular cleaning and maintenance to ensure they are kept in a good, safe condition and that the intended play qualities are maintained.  The artificial grass or astro turf carpet is generally sand dressed and as such will filter out contaminants within the sand infill particles which will aid compaction of the fill, which in turn will affect the play qualities of the system and begin to reduce its porosity.  The carpet fibres will become crushed by the activity of play and become less supported by the infill as the sand particles become compacted within the system.  This will further aid the growth of moss and algae within the synthetic grass surface.  It is therefore beneficial to have a moss and algal chemical applied regularly to the facility to kill off any live spores and help prevent the establishment of such spores.  Depending on the courts location, especially in regard to shade, airflow and surrounding vegetation, this application should be done at least once but if there are areas subject to poor sunlight and airflow a secondary application may prove beneficial.