AG Limestone is an agent added to soil to help raise the pH without adding trace amounts of magnesium like Dolomite Lime.
This Limestone contains 4% magnesium compared to Dolomite which is approximately 14% magnesium. Ag Lime contains aragonite which is a crystal form of Calcium Carbonate, Calcium carbonate is water soluble while magnesium is not. Our Oyster Shell Flower is pure calcium carbonate and can be dissolved in water but that can take several days/few weeks.