Im not sure exactly what you are asking? Are you asking what pressure? If so, you shouldn't notice a terrible amount of pressure differential between each aide of the filter between a clean filter and a dirty filter. That being said you can install a spring based pressure valve with a diaphragm. Dialing in the spring type to get the proper "k" value is going to take some trial and error.
As an engineer. The question is "how do i get the most out of each filter" and the answer is buy a washable filter. Wash it as much as you want. One time cost.
Chrillis, ME
