My well water starts not far from that, ends up about 230 after a simple carbon filter. 230 is pretty nice, I would not want to go less. The goal sure as hell isn't pure water, the goal is nutrient water.
25 gallons would be fine on a normal day, but when I need 140 gallons what do I do? It's going to take a lot of work and 2 days at least to get the job done, I just turn the water on and go have a smoke, come back in time to watch the it finish, just make sure you come back in time, at like 8 gallons per minute it will make a mess quick.