What we did here and it worked great was to use a recycled crushed concrete. Its called 4" medium. There is a group of smaller sizes in it but mostly 4". Why this is so good is the fact that the product has been crushed and has sharp edges. Round rock will never pack in and keep any bank from eroding. Secondly it looks great. Its not very pleasant to walk on in bare feet mind you but its very white.
The other good thing with this product is it as very very cheap. We took in 500 ton for $1000 Canadian. The whole pond has it 12 feet in length about 5 feet in depth around the 1 acre kidney shaped pond.
One more thing is that the concrete is keeping our PH up for us. How long this will be the case I do not know but we have millions and millions of crayfish that love the stuff.
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