Tortaddiction: How to make homemade calcium blocks for ...
· First, you need to decide on the calcium source. Foodgrade calcium carbonate (CaCO 3) is one good option, sometimes called Limestone flour (available on Amazon).Another, more affordable and more easily available source is so called Agricultural Lime (CaCO 3) I got it at our local feed store for 8 for a 50lb bag!Agricultural lime is produced by pulverizing limestone or chalk, and is ...