see if anyone in the area has a cement mixer. put them in and tumble them for a
while, that should knock the edges off.
If you have a small amount, then try putting them in a bowl and pouring muriatic acid
into the bowl and wait. it will dissolve limestone chips first. then rinse well.

"Davy" wrote:

Thanks guys for the informative answers. Seems I can, and should, use the
limestone chippings and worn pebbles.

My only problem now is that the crushed chippings contain some very small
sharp flakes which may harm the lining. I don't seem to be able to sieve
these out since I cannot get the chippings dry enough - even a small amount
of moisture makes the very small flakes stick to the larger pieces. Washing
is not reliable for much the same reason.

many thanks, Davy


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