It's very easy, just use the wizard (opens up every time you click on each DOS pump head). Basically, click to modify the interval on the dosing lines to have both pump heads turn on/off at the same time and for the same amount of volume for each, Apex figures everything else out. For example, I'll have both heads turn on from 16:00 - 19:00 to change out 4353mL (which is 1.15gal). Just make sure you know which head is removing and which is adding. For mine, I made pump head #1 remove and #2 add. That's it!
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