Might be an idea to have a look at the drinking water pressure tank part of your system to make sure that's not causing you all the grief. Perhaps bypass it if you can & see what happens. I don't have anything like that on my system, so don't know anything about how they plumb in, might be a red herring. It does add complexity though & more things to go awry. Personally for drinking water, I simply bypass the DI stage when I do a water production run & deliver the 1st 6 gallons of water to a standard water cooler jug. This has a side benefit of ensuring that when I do open the valve to the DI stage, I know the RO from the membrane is as low as it will get. Short production runs are hard on a RODI system & filling the drinking water pressure tank could be considered a short production run. It will take a few minutes for the RO output TDS to drop to optimum based on your tap TDS.
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