Please look at the math I have presented earlier in this and other threads, which was first shown by Mason in his text in the chapter on washing. The basis for it is dC/dT (Change in Concentration in the film or paper vs Time) and the only way to prove what is good is to test with a hypo retention kit and a silver retention kit. Mason and others do show that running water is better than standing water, and agitation is better than no agitation.