TOM Flow Meters

[tholleyh46]

Anyone ever use these on saltwater? I have an Iwaki magnetic pump rated at 750 GPH returning water from my sump back to the tank via three different return lines. Considering adding one of these (rated to 250 gph each) on each reduced pipe. I'm assuming I won't get 750 per hour going up hill, etc. and won't max out the meters.

I have 3/4 PVC coming from the sump going to the pump which is reduced to 1/2 going into the tank for three different spray bars. Using the valves I'm assuming I could actually see the pressure going through each and adjust them up slowly to try to even the flow. Seems easier than the stick your hand out front and feel method.

What do you all think? Perhaps this is overkill. Unsure.