Thanks for the help - this is all pretty new to me. VFD's were recommended by the pump rep - not really sure if we need them either, but was worried about excessive cycling (which I'm assuming can be mitigated by proper sizing). The pump sizing is preliminary and yes, needs to be adjusted...
We are working on an environmental remediation process design for collection of spring water into a wet well/sump (5' diameter x 10' deep) and then pumping the water through carbon vessels for treatment. Typical flow rates are 10-25 gpm, but during heavy rains can go up to 500 gpm. We are...