This filtration process takes away the salt and metal ions that is typically found in H2O and pushing it through forcefully membrane filter pads. Since the pores are so small in the semipermeable membrane this can remove microbes and bacteria from water as well.
Many wastewater treatment facilities and high-end restaurants use reverse us most system water filtration machines to produce the drinking water.
Many people will use R/O water filters to initially create healthier water and then run this through their water ionizer machine. You can also use this with your mini demo ionizer.