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Low hazard for health. Derived from minerals, chalk is degradable and suitable for greywater and septic tanks.
Calcium carbonate is a common substance found in rocks in all parts of the world, and is the main component of shells of marine organisms, snails, coal balls, pearls, and eggshells. Calcium carbonate is the active ingredient in agricultural lime, and is usually one of the causes of hard water. It is commonly used medicinally as a calcium supplement or as an antacid, but excessive consumption can be hazardous. Read more: http://en.wikipedia.org/wiki/Calcium_carbonate