Went to a local South Devon merchants to ask about Sharp Sand for laying patio slabs on and they don’t have anything called “sharp sand” What they have is “silver sand” and “red sand”. They say silver will do but there’s also something called Wareham Grit which they say will also do. But a bit of online research sees it listed as a general building sand. So I’m confused. Any South Devon based builders know which one to use locally?