A conventional street sweeper with or without vacuum does not exert enough energy on the paved surface to break the adhered material free, nor can it apply effective amounts of energy into the pavement voids where the rain loosened solids have collected for us. Conventional sweeping will extend the original functionality of a pervious surface, but inevitably, enough solids collect to reduce and eventually eliminate stormwater percolation. A hygienically applied high pressure spray and recovery is required to finish the job and to keep pervious surfaces functioning.