I use a modded BRS unit with a combo of BRS carbon blocks, dow membranes and Spectrapure DI. Depending on how much water you need to make, the 75gpd is probably good enough. The great thing is that you can always expand the system. Mine started out as a 4 stage water saver unit and now I have a 7 stage system. LA water is shit, so dual carbon blocks are a must and something to remove silicates. I was using all BRS media, but their resins would expire faster than the Spectrapure resins.