Warren Buffett is not known for buying the most exciting businesses out there, but he is known for making some of the best investments. It's a thought to bear in mind when considering investing in Pool Corp. (POOL 0.47%), one of Berkshire Hathaway's holdings.Here's why.Why Pool Corp. is a great Buffett stock to buyThe case for buying Pool Corp. is simple. The company holds a dominant market share in a highly fragmented yet growing market. Remember that, even if new pool construction growth is slowing, the i ...