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Simple Water Level Indicator - This is the circuit graph of a straightforward erosion free water level marker for home and industries.In truth the level of any conductive non destructive fluids can be measured utilizing this circuit.The circuit depends on 5 transistor switches.Each transistor is changed on to drive the comparing LED , when its base is supplied with flow through the water through the terminal tests. 

One cathode test is (F) with 6V AC is set at the base of tank.Next tests are put regulated over the base test.

At the point when water is rising the base of every transistor gets electrical association with 6V AC through water and the comparing probe.Which thusly makes the transistors behavior to shine LED and demonstrate the level of water.The finishes of tests are joined with relating focuses in the circuit as appeared in circuit diagram.Insulated Aluminum wires with end protection evacuated will accomplish for the probe.Arrange the tests all together on a PVC channel as indicated by the profundity and inundate it in the tank.AC voltage is use to anticipate electrolysis at the probes.So this setup will last truly long.I ensure no less than a 2 years of upkeep free operation.That's what I got is as yet going.