Patent ID: 8262845

Claim:
A processing system comprising: a first container, the first container being adapted to contain a fluid and a semiconductor device; a second container fluidly coupled to the first container, the second container being adapted to receive and retain an overflow amount of a fluid from the first container; and a controller, wherein, while the semiconductor device and the fluid are contained within the first container, the controller is adapted to maintain the fluid to a substantially constant level in the second container by continuously flowing the fluid on an outer vertical sidewall of the first container thereby forming an evaporative vertical surface during an entire duration that the semiconductor device is contained in the first container, wherein the controller is adapted to maintain the continuous fluid flow by a continuous flow of deionized water into the first container during the entire duration that the semiconductor device is contained in the first container, and maintaining a height of the evaporative vertical surface by maintaining the fluid in the second container, wherein the controller is adapted to maintain the height by keeping the fluid between a first lower sensor and a second upper sensor, wherein the first lower and the second upper sensors are placed close to an upper edge of the first container, and wherein the controller is adapted to maintain the evaporative vertical surface is maintained during the entire duration that the semiconductor device is contained in the first container.