Good day all, This circuit is a water sensor I designed. Point A and B are the sensing terminal.When I tested this circuit on breadboard with short jumpers it worked very well but when I used long cable(5meter and above) to to test in a water tank, the circuit became very unstable so that even when without touching water it triggers the relay. I was noticing huge noise in the circuit. Pls can someone tell me what I need I to add to eliminate the instability and noise bcos the nature of the app demands very long wires...thanks in advance