De WaterPurifier⁺ contains ultrafiltration membranes which are made up of billions of microscopic pores. These are small enough to hold back all pathogenic microorganisms (viruses, bacteria, cysts and protozoa), but are large enough to allow through vital minerals and salts. The WaterPurifier⁺ also contains activated carbon. This reduces chemical contamination such as chlorine and medicine residues and improves the taste and odor of your water.