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Okay, my reply is 9 years late but better late than never. 

A very simple flood alert can be made from a house smoke alarm. The alarm already has the 110dB siren, battery holder and connections. Just soldier 2 wires across the TEST bridge button. Dangle the other end of wires into tank at the fill level and when the water reaches this spot the electrical circuit is completed. 

 

EDIT - My water level alarm finally died after 15 years of faithful service. I went down to Bunnings and was shocked at the prices for new,smoke detectors.  And the newer models use  particle detectors. However, I found a water alert for $13 which is still $10 more than what I wanted but it's easily adapted in a similar fashion. 

 

Has anyone got a water tap controller & app on their phone? 

 

 

 

 

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