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Cheers ColJack for the reply. That's a great idea thanks ! We have already put holding tanks in between pumps so the idea of a float switch to control the pumps is perfect. Presumably if they are set up to switch the pumps off so that only one or two run at a time then this could work. I...

I am based in China and have 3 identical 60 meter 220v 1500 w water pumps supplying water up a hill of height about 120 meters and distance about 260 meters. They are currently connected in parallel but the problem is that they are all running at different speeds hence the water is not being...