non stepper motor based dosing pumps

[fietsenrex]

You can also increase accuracy by dropping the voltage on the dosing pump.
I have one of my 12v dosing pumps running on 5v which has increased the accuracy dramatically

Running a steppermotor on a dosing pump doesn’t account for worn out hoses, mix errors in you additive solution, clogging of hoses, forgetting to refill the containers.
Al sorts of human error, my point being is that using expensive steppermotors and interfaces doesn’t have to be much better than the normal DC pumps