Sand for potting mixes
Peter Taggart (Sat, 15 Nov 2014 15:42:28 PST)

The product which I know as "sillica sand" in the UK, is a very fine sand
which is very fast draining. Soft sand / builders sand is quite different
and used for mixing mortar, it is unsuitable for horticultural use. The
sand for potting mixes or for plunge beds, (apart from the expensive
"silica sand"), is known variously as coarse/ gritty/ concrete sand.
Peter (UK)