Surge Grey Stone is used for storm water infiltration pits, drainage and erosion control, construction entrances or stabilization of muddy areas. This one is a hybrid gravel, and it is well-loved because of its high, water draining capacity.
It is considered a hybrid gravel since it is made from the mix of clay, dirt, large, and small gravel with a bit of sand. It is usually used in filling area gaps in the landscape.