Hydrated lime, limestone difference | Fungifun
May 02, 2010 · Limestone is 97% CaCO 3 with less than 2% magnesium. 3. Limestone Grit: Produced in a fashion similar to limestone , limestone grit is rated according to particle size after being screened through varying meshes. Limestone grit is an excellent structural additive but has low buffering abilities. A number 9 grit is recommended.