As above, be careful what you are buying as 'Crusher run', some is recycled material, 'sorted' to a degree then put through a crusher.
I worked at a Recycling plant some years ago. The initial material we had to crush was all concrete and brick, and a fair amount went for car park sub base at my local Asda. Once we'd got through that though, the quality of material coming out from the sorting line was to be frank, bloody awful. Trommels only sort by size, so with the lumps of brick and concrete, we were getting lumps of clay too, the Manager wanted it all through the crusher, (which was a nightmare in itself), as he thought he could sell it rather than have to pay to get rid of it. (He soon found out no-one would buy it.)
