Any idea if you can change the direction of the pump? My tubing would fit better if the flow went the other way based off where one pulls from and one empties to.You will still want to calibrate it if the amount is something critical but do it at the flow rate you are going to use. The way Hydros calibrates is it runs the pump for 1 minute and you measure the amount and tell the Hydros how much was dispensed. It then uses that to either reduce time run or add to it to get the desired does you want to dose. I would also if it was me drop the flow off of maximum flow. I don't like running things at their absolute maximum ratings if I don't have to. You should be able to run at 200ml a minute without any issues it will just run longer each time.
