To cement the stones around your pond, start by mixing up half of an 80 pound bag of Quick Crete. Pour the 40 pounds of concrete into a metal container, add water and mix it together. Add just enough water so that it is not too runny. Put down a base of cement around the pond where you will lay the stones. Lay the stones in the cement, then put some cement in between the stones, and smooth it out.
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