Can I use pea stone as a filler? I am considering for my driveway, which is currently hardpack (stone, gravel, stone dust) and is messy as the dirt get tracked into car and house. Neighbor has pea stone driveway, which cuts down on mess, but gets scattered with snow removal. These grids and pea stone seem like a good solution. Is there a way to make pea stone work withbyour gri