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Sand in the Joints
As the chunks are puzzle pieced together, you are constantly moving sand to allow a good base beneath each new piece, and enough sand to slide a berm in front as you push it up against the already set pieces. This berm of sand makes a joint between the pieces. It is very important to not fill these joints in with dirt or mud, but only sand as it drains water so well and mud will repel the water and create puddles.
