A series of experiments were conducted to examine the stability of sodium dodecyl sulfate (SDS) and SDS+NaCl foams in a dynamic foam analyzer where the concentration of the SDS was higher than the critical micelle concentration. A series of tests were done to ensure that the results from the foam analyzer were repeatable and consistent. The results from the experiments demonstrated that the dynamic foam analyzer can produce consistent and repeatable results. As the concentration of SDS increased, the stability of the resulting foams was enhanced. Profiles of the foam height, average bubble size, and bubble count were obtained versus time. The measurements permitted the estimation of the average liquid drainage rate from the foam – this is a novel contribution from the work. Given that the liquid drainage occurs from the liquid films in the foam, this is an important value for evaluating the relative stability of the foam. The SDS and NaCl experiments revealed that the addition of NaCl further stabilized the foam leading to lower average liquid drainage rate from the foam.