base for block wall - use sand or not?
I'm planning a 2 foot high interlocking block wall, and have been watching videos about preparing the trench. All say to use gravel or crushed stone in the bottom of the trench. Only a few advise a 2 inch layer of sand on top of the gravel, for easier leveling of the first layer of blocks. It sounds like a good idea to me, so I wonder why they don't all recommend sand.
What would you advise?