Volumetric flow meters use a constant volume within know levels in the wet well to calculate a 100% accurate average flow, this is done during the filling portion of the lift station pump cycle. Assuming that the entered dimensions or volume is accurate, volumetric flow meters are the only flow meter able to claim 100% accuracy. When the pumps run interpolations, averages, quadratic equations and other mathematical algorithms are used to estimate the most probable flow in the station. Selecting the algorithm that reflects the most accurate real flow for this portion of the pump cycle is a trade secret, and it is the key to the accuracy of a volumetric flow meter. Over the last 20 years, Maid Labs’ staff have written multiple patents related exclusively to this technology.