[shrimpchips]

Actually when you adjust the dosing it's much better to run the calibration - it's actually quite simple.

Set up your dosing pump system and all the tubing as it will be when it's running. The run the ml/min calibration. The trick to get it fairly accurate easily is to use a kitchen scale that is accurate to +/- a few grams. This is what I did:

1. Set up whole dosing system including the full length of tubing you're going to use - this is important as the flow rate can vary depending on the length of tubing you're using, and the height of the doser from the containers can also affect the rate at which they pump.
2. Put a container that will hold about 100 ml (empty) on the scale, and tare/zero it.
3. Put the suction side of the pump being calibrated into RO/DI water, and run it untill water comes out the outlet side.
4. Run the calibration menu - pump for 1 minute into the container while the scale weighs how much water is pumped out. Since the density of water at room temperature is about 1 g/ml, the amount pumped onto the scale in grams is the amount in ml the pump pumps in one minute.

Easy, and farily accurate. If you're anal (ie, myself) run it three times and get an average value - I found single pumps to not differ run to run by more than 0.7 ml each trial and only by about =/-3 ml across 4 pumps.