I believe most RO
units operate optimally at around 65psi. Most well systems won't produce this pressure continuously. You'll likely have a pressure tank in the mix, where a pressure switch activates the well pump when pressure in the tank drops below a pre-set level. Perhaps you can set the trigger point a bit higher to help. Booster pumps are available to up the pressure, although the ones I've looked at are a bit expensive. The trade off may be $ for a booster pump v. no booster pump, less than optimum RO
unit performance, more waste water and slightly shorter filter life.
It's tough to answer the filter life question without water test results to compare for both your municipal and well water. I believe heavy metals would be your worst enemy and you'd think the chances are greater that they would show in your ground water. Then again, I've seen municipal water test results that are scary compared to local ground water. Your municipality should have test results available for you. You're on your own to test your ground water. With a breakeven point for the well installation likely to be years in the future, I would view RO
issues as relatively minor. Waster water can go to the garden and if your filters need replacement every 9 months instead of 12, well, that will be one of your lesser expenses of home ownership. HTH
somewhat. Good luck.