Will the system stay permeable forever?

As a permeable system the Gravel-Lok bonded pavement is full of voids which allow water to pass through. Like any other permeable pavement those same voids will eventually get clogged with dirt, dust, debris and this will reduce permeability over time . There are vacuum services specifically designed for porous pavements which are becoming increasingly popular. Recommended cleaning depends on site conditions and the amount of sediments the system is exposed to. Without maintenance, typical permeable systems become completely clogged within 5 - 7 years.