I'm trying to measure water flow thru my pool pump system. I've got 2-1/2" SCH 40 pipes running water around, but a flow sensor for pipe that big is pretty spendy. It occurred to me I could break out a smaller parallel path that would fit a smaller, cheaper flow sensor.
My question is, what is the relationship of the flow thru the smaller pipe to the bigger pipe? Would there be water flow? Would the elbows reduce the flow thru the smaller pipe ?
