Relatively maintenance free, requiring only basic lawn maintenance (watering, fertilizer and mowing) for grass filled grid-pavers. Snowplow at least 1 inch above the grid-paver. Two-Stage Snow Blower is recommended for snow removal on uneven or gravel surfaces because it has two augers involved in the snow removal process. The first auger is a slower moving steel serrated auger that chops and breaks up the snow. The snow is then pushed back into a second high-speed auger, which throws the snow out the chute and out of your way. No part of the augers ever come in contact with the ground, snow on the ground is pushed along via a scraper bar on the bottom of the unit. For gravel you just adjust the unit to leave a small layer of snow behind avoiding the gravel all together.