What elements are in the water before and after the RO process?
The RO process removes about 95-99% of particles, bacteria, organic materials, and the same percentage of dissolved ions (metals, elements). Most things with a size of >.0001 micron are removed. Here is a link to a table from Osmonics (one of the membrane manufacturers) that shows what is removed by various processes. http://www.osmonics.com/library/filtspec-s.pdf. The way the membrane works, it can never completely remove every contaminant, so the more that comes in the feed water, the more that will go through the membrane. Additionally, gases pass through the membrane freely. Therefore, of the water that goes in, about 1-5% of any element that went in will be present after the RO process, and gases will pass through.
