Here I would just like to pay a little tribute to the authors of the SSSP User Manual and you leave you with a quote from the manual's conclusion.
"At this point it s beneficial to reflect on the nature of SSSP. First SSSP is a tool. If used correctly, it can provide insights into the activated sludge system which you may not have possessed. . . . As engineers and scientists, we advance our profession through the use of the tools that are available. As Archimedes said, "Give me a lever long enough and a fulcrum strong enough and single-handed I can move the world." SSSP can be a lever to gain insight into the biological processes occuring in the activated sludge treatment plants. However, your knowledge, experience and educational background compose the fulcrum upon which the lever rests. The stronger they are, the more you will learn."
Bungay, Henry R. Environmental Systems Engineering.