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Dec 21, 2017 Used to make mortar for laying bricks 3. Silver Sand. Also known as, Jointing Sand, Masonry, White Sand or Washed Sand. Used to make white renders Brush into block paving to lock paving together 4. Potting Grit. Coarse grit which is lime free with particle sizes ranging from 2 – 4mm, 4 – 6mm 6 – 10mm. Used to make ideal growing mediums.