I do not believe in ballpark numbers as they can be very lisleading. A more accurate measurement then that Blue White would be a simple litre cal column on the pump intake. We do it as a backup on our industrial chemical pumping skids even with mag flowmeters.
Example: Put a T at the pump intake (preferrable with at least a foot between T & intake to reduce turblance at the pump) with a FULL port ball valve on each side with 1 going to cal column, other to original intake line. Since it's also a closed loop, most likely need another T setup on return side to collect liquid.
BTW, I do like your pump choice.... don't see enough Little Giant pumps on the forums.
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