Hydrology 9The Hydrology 9 is a complete game changer when it comes to vaping dry herbs. It works in a similar way to many conduction vaporizers except that it has built in water cooling that reduces the temperature of your vapor and increases the comfort and pleasure experienced when vaping. The Hydrology 9 is the result of countless design changes and revisions, each one designed to improve the quality, consistency, and performance of the Hydrology 9. With a