Only the highest quality kiln dried cedar wood is used from the

core, or heart, of the tree. Each stave fits precisely together with the

circular base, and are held tightly in position on base by three

stainless steel hoops. Once the tub is filled with water, the wood

swells to form a watertight seal somewhat like a boat or wooden

keg for maturing wine. This practice called cooperage has been

widely used for centuries and is extremely effective.