Hi all,

My pond project is coming along well but I have run into a snag. I
have excavated up to 38 inches in the deepest section. My soil is
pure sand. I have a deep well in the middle and have constructed a
concrete block retaining wall for that section. There will be an
18-inch shelf area surrounding the "well". I want the pond shape to
be curved so the concrete block retainer presents some problems. The
blocks are rigid of course so there are gaps at the joints where a
curve begins.

What other material can I use to retain the sand in a curved shape?

TIA

John