White Brick Sand is specially formulated for light coloured mortar. It is used as a bricklaying medium when mixed with cement. Common mix ratio is 5 or 6 parts sand to 1 part cement and 1 part Lime.
Although referred to as white brick sand, it is almost invariably an off white to grey colour that can alter from batch to batch.
Mortar colour can be changed with the addition of a coloured oxide.
Is also used as a base under above ground Pool liners.