I built this 555 pump controller and it works correctly if I short the wires, however, when trying to use the electrodes in water it doesn't do anything. I am using a 12V 1A power supply so I don't think it's a current problem.
The description with the diagram says increase the 100k resistors for more sensitivity, so I made them 1M but still nothing. Why would increasing them help? Surely that will lower the current. Also is 1M enough?