Perfect as in completely smooth and level on all sides. My 7x7 ft diameter circle pond hole has a lot of rocks and junk in it. I can definitely level out the bottom with sand but the sides of the hole is the main problem. There are so many voids and open pockets from all the rocks that were removed and is impossible to level out smoothly. Do I really have to smooth out the sides or will I be ok? If not, how do I go about this? It's almost like swiss cheese.