There are many water purifiers in the market and they claim variety of things including bringing taste back to the water which is generally lost in multiple filtering process.
The basic purpose of water purifier is to remove the unwanted chemicals and minerals from the water and also the bacteria and viruses. Many good water purifier are able to achieve these objectives by special filters and use of ultraviolet light etc.
The water purifier will remove impurities such as chlorine, lead, mercury, magnesium, chromium, copper, nickel, iron, hydrogen sulfide and more like these even in traces. It will also kill bacteria and viruses in the water and remove them.
During this process a lot of constituents, minerals and impurities from the water, are removed and it affects the taste of the water. To bring the taste back the companies use a technique of taste enhancer which is nothing but adding a mineraliser cartridge or activated carbon filter after the processing of water is done by the water purifier. So it is same thing under different nomenclature.
This to some extent adds the required minerals in the hygienic ways and bring the taste back near to normal. Different companies market these products under different nomenclature and description only to create confusion and as to showcase their product differently.
Knowledge is power.