HOLD the SALT: This desalination plant in Tampa, Fla., is the biggest reverse-osmosis facility in the U.S. Image: Tampa Bay water.

留住盐分：加利福尼亚的坦帕，美国最大的反渗透海水淡化厂。

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And unless you want to lick rainwater from leaves, make sure the island has ample potable water, or you'll be installing a desalination facility.

FORBES: Most Expensive Private Islands 2005