Can the electromagnetic flow meter measure the flow rate of softened water?
You really need to use electromagnetism, you can only use a capacitive electromagnetic flowmeter. Currently on the market the main parameters used is the conductivity of a medium must ensure that, if only to soft water calcium and magnesium ions conductivity or enough, you may get some medium with pointer multimeter measuring a resistance value, the conductivity is not enough to see.If the conductivity is not enough, see the installation environment conditions, the caliber of the requirements, choose other flowmeter. Of course, the work characteristics of the medium should be taken into consideration.
If the caliber is small, you can choose vortex flowmeter, large bore rotor flowmeter cost is cheaper.
This depends on the conductivity of softened water, in fact, the following 10US/CM do not use electromagnetic flowmeter, although some manufacturers are known as 5US/CM measurable, but the actual application can not guarantee accuracy.