You can correlate the pump speed setting with the flow rate, but you should measure the actual flow rate with a graduated cylinder and a stop watch.
(You; can correlate; the pump speed setting with the flow rate) (the pump speed; setting; with the flow rate) (you; should measure; the actual flow rate; with a graduated cylinder and a stop watch)
You the pump speed you
can correlate setting should measure
the pump speed setting with the flow rate
with the flow rate
the actual flow rate with a graduated cylinder and a stop watch