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Mar 11 at 10:18 history edited Michal Podmanický CC BY-SA 4.0
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Mar 11 at 10:17 comment added Fredled I have done such a system. The problem is to have enough pressure to actuate the button. At a high water level, this pressure may not be enough. There are also problems with corrosion and contactor reliability. But the concept works. I will write More on this later.
Mar 11 at 10:12 history answered Michal Podmanický CC BY-SA 4.0