Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: How to Add Calcium to a Concrete Mix
Dissolve calcium into water prior to mixing with concrete. Agitate the water to help the calcium flakes to dissolve. Mix concrete together as per normal using calcium enriched water.
Add calcium chloride or limestone to the water before mixing concrete.