The general practice in KZN for an effective treatment for white ants (subterranean termites) is preventative, in that it is done at the time of the construction. The compacted soil is sprayed with a registered termiticide, prior to the concrete slab being laid.
However, where the infestation is detected in an existing dwelling, holes are drilled along all walls and the termiticide injected into them under pressure. In some instances, the foundation perimeter would also be excavated and flooded with the chemical. All holes and excavations are repaired and are seldom noticeable on completion.