In article ,
Mike Lyle wrote:

It may be worth emphasising that gardeneers* mean something very
different by "sharp sand" from what you get from builders' merchants.
For the garden, "sharp sand" is grit with bits up to an eighth of an
inch across, and, unlike the builder's kind, won't really clump
together.

Actually - builder's sharp sand is fine. You can wash it if you
like before using it, but it's not critical. What is NOT useful
is the sort of sand you use in mortar.


Regards,
Nick Maclaren.