Volucalc is able to calculate flow in and out of a pump station, at the end of a pump cycle, but it could also takes a few cycles, depending of the conditions. So Volucalc’s flow isn’t in real time, which is not the case for Volucalc RT. The flow algorithm within Volucalc RT is more sophisticated. Also, its algorithm can be used to calculate the volumetric capacity of the pipes feeding the lift station, which is something Volucalc cannot do. If the goal is to have the lift station flow calculated by Mermaid at a later time, then both products can do the job.