It's not your generic RO acquired in a very hardware retail outlet, although some huge chains have it. Input TDS = ~225 ppm, output TDS = ~15-20ppm. Does the job. Haven't tested PH however. Water tastes great mainly because it does with my first system. Transform your pre filters http://water-filters45668.amoblog.com/the-fact-about-water-filter-systems-that-no-one-is-suggesting-16755846