Over time, the infill in the surface may become contaminated with dust and fines. When this occurs a 'crust' can appear on the carpet affecting the playability and porosity of the surface. Depending on the severity of the 'hardening' different techniques can be applied to rectify the problem. Regular Power Sweeping will help to minimise this risk, removing this dust and fines before it has chance to mix with the clean infill. A more extensive process is a Revite^® which gets much deeper into the carpet pile, lifting the top section of the infill to remove the dust and other fine particles, before replacing the infill back into the surface. The process is very specialist and can only be carried out in the dry weather.  If the situation has become so severe that the court fails to drain after heavy rain, it could be that you require a Rejeneration^® of the surface. This patented process uses compressed air to remove the top half of the infill completely, which is then replaced with fresh, clean infill, bringing the surface back to an 'as new' condition.