This brought the already-high pH 10.5 water up to pH 11.5 - which was tested on a calibrated pH meter. Rather too high for drinking water. Additionally, it was not until I got the system that I learned high pH water requires more-frequent replacement of the reverse osmosis membrane (also every 6 months). Our water has such high pH due to "lime softening" at the municipal water treatment plant.
Available RO systems are hard to understand. Aquasana's was the easiest to understand and install. A quality product. Even better is the ease of its periodic replacement.
Pros: Clean taste, Durable, Easy to clean, Easy to install, Long lasting filter