Please capitalize where necessary: this design calls for a 600 mm planting media placed on top of a 150 mm layer of fine aggregate concrete sand that is on top of a 400 mm layer of #7 washed gravel.
This design calls for a 600 mm Planting Media placed on top of a 150 mm layer of fine aggregate concrete sand that is on top of a 400 mm layer of #7 washed gravel.