Highly absorbent carbon is used to attract and trap impurities in the water, which is particularly effective for removing bad tastes from the water. The filters also tend to be suitable for reducing dangerous contaminants such as lead, mercury and copper, but you should check for certification.
These type of filters boil the water to remove impurities, then recondense the purified steam into drinkable water. This will get rid of heavy metals such as copper, lead, mercury, chromium and cadmium. It will also get rid of sodium, fluoride, arsenic and selenium.
The best countertop water filters should be easy to install and operate. You will also need to decided whether you want one with changeable cartridges, or whether you are willing to call in a professional to service your filter. Once it is installed, you need to ensure that it is given regular maintenance so that it remains effective in removing contaminants.