Reasonably price flow switch

Does anyone know of a reasonably priced flow switch? I am working on my pool project and would like to detect when there is water flow or not. I don't want to take a PH/ORP/Temp reading if the water is now flowing through the system as the readings would not be valid for the main body of water....the would only show what the reading in the pipe is.

Any help is appreciated.

PiperPilot
 
Do you really need a flow switch? You might just be able to monitor your pump and assume that if it has voltage, then you have flow. An alternative would be a pressure switch, still not as accurate as a flow switch, but a lot cheaper and easier.
 
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