http://www.villagemarine.com/images/7829lw.sq4in1_2.pdf

We find that the flow of water production relates to the pressure that you induce on the membrane. On our MPW 600 (a Village Marine AC unit) there are two adjustments -- the overall (gross adjustment); and then you can adjust the cleaning vs. product lever.

I you give Village Marine a call, they can talk to you about it. There used to be a "store" in South Florida.