What is better to use when removing outdoor odors lime calcium carbonate or hydrated lime calcium hydroxide?

Answer 1

Hydrated lime. It has been used for hundreds of years to deoderize everything from human wastes to animal wastes to decaying bodies. Calcium carbonate is simply ground up limestone, and although it is great for raising the pH of your yard or garden it doesn't do much to eliminate smells. Hydrated lime also has the advantage of being a dessicant (it absorbs moisture). M. Miller, Lime Specialist, U.S. Geological Survey

Answer 2

It is better to use hydrated lime (calcium hydroxide) for removing outdoor odors. Hydrated lime is more effective at neutralizing odors than calcium carbonate, as it has a higher pH level which helps to break down odorous compounds. Additionally, hydrated lime is safer to handle and less likely to cause skin irritation compared to calcium carbonate.