We have a puzzling issue that hopefully you will be able to help us with. I don't know what information will be relevant to the solution, so I'll supply everything I can think of. We live on 1 acre and have a 12 zone system around the house. Our water comes from a well, supplied by a Grundfos Constant Pressure system (ie it only pumps fast enough to keep up with the pressure demand). The valves in each zone are K-Rain Pro Series 100 valves, which are supposed to be good for systems fed by well w...
