Assalamo Walaikum...
Connectify Pakistan (Pvt) Ltd does have the solution for water tank & for over flow. We have wireless sensors that when "detects water, turn off the motor as well as notifies you on your mobile" it can also switch off the valve of your pipe to cut off the water supply as well. Please call for details:
We have other Smart solutions for you.
Smart People Smarter Living - Connectify Pakistan (Pvt) Ltd.
connectify.com.pk
0300-233-4333