There are various types of purification media applied in water purification systems: activated carbon, reverse osmosis (R.O.) membranes, Ultraviolet (UV) sterilizers and now the FilartechTM fiber membranes. FilartechTM and R.O. membranes are used to remove red rust, turbidity, microscopic dirt like bacteria and coliform bacilli to make water clear. However, R.O. membranes also remove minerals dissolved in water. Both R.O. and UV sterilizers require electricity so the places where they can be installed are limited. As seen from the chart, the best purification media is the activated carbon plus FilartechTM fiber membrane used in the HDI PURE FTEC-1 Water Purification System.