PurePro Eco RO Membrane features next-generation membrane technology offering the highest quality permeate at 30% lower energy consumption. Enabled with a Mineral Guard technology, this membrane retains essential minerals in your drinking water, making it safe, pure and healthy. The size of the pores on the Eco Reverse Osmosis (RO) membrane are 0.0003 microns allowing it to remove bacteria, viruses, heavy metals, viral contaminants, and other dangerous elements while still allowing valuable minerals to pass through, and for your body to absorb.
R/O Drinking water should contain minimum levels of certain essential minerals
English version: (World Health Organization)
https://www.who.int/water_sanitation_health/dwq/nutritionschap12.pdf
Chinese version: (World Health Organization)
https://www.purepro.us/zh_tw/water_sanitation_health_nutrientschap12.pdf