There is nothing in this world constant but inconstancy.—SWIFT
It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.—FRANKLIN D. ROOSEVELT
Chemical engineers learned long ago that a process that works in the laboratory cannot be implemented in a factory in only one step. An intermediate step called the pilot plant is necessary to give experience in scaling quantities up and in operating in nonprotective environments. For example, a laboratory process for desalting water will be tested in a pilot plant of 10,000 gallon/day capacity before being used for a 2,000,000 gallon/day community water system.