I used concrete block with aluminum conduit down thru the holes, filled with sand
from the hole. very stable. Ingrid

John Bachman wrote:

I have dug out my pond. Our soil is pure sand below the loam - easy
digging but not good for stable, vertical sides. How can I keep the
sides nearly vertical? I have heard of mixing some cement with the
soil to give it more adhesion.

Does anyone have experience with this or other techniques?

TIA

John