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For permeable pavers with aggregate in the joints, pressure washing is not recommended, but vacuuming is an effective means of maintenance. For large sites, specialized vacuums are available; most small sites can be maintained with a heavy-duty shop vac. Some aggregate will be removed in the course of maintenance vacuuming and will need to be replaced properly. In the following video, participants took part in a live demonstration of a vacuum sweeper - revitalizing an 8 year old UNI-ECOLOC permeable pavement (PICP).