De WaterFilter⁺ contains microfiltration membranes which are made up of billions of microscopic pores. These are small enough to hold back pathogenic microorganisms (bacteria, cysts and protozoa), but large enough to allow through vital minerals and salts. The WaterFilter⁺ also contains activated carbon, to reduce chemical contamination (for example by chlorine and medicine residues) and improve the taste and odor of your water.