- These large boulders make for good seating or jumping rocks. Both weigh about 250 lbs. and have a better texture than most natural stones. A wide variety of boulder sizes and styles are available for pool edges and landscaping.
Rocks intended to go underwater are special order and are solid hollow. Dealers must fill the boulders with concrete to avoid stagnant water. Boulders are sometimes used to mark the edge of a tanning ledge.
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