Household water filters have become one of the common appliances in modern households, used to provide clean and safe drinking water. However, water filters are not "one size fits all". There are many types of filtration systems inside them based on different functions and technologies.

Activated carbon filtration is one of the most widely used non-reverse osmosis water treatment technologies, especially in household water dispensers and filter jugs. It has a strong adsorption capacity and can remove organic matter, residual chlorine, odor and some heavy metals in water.

The following are several water filtration systems commonly used in hospitals: Reverse osmosis (RO) system Ultrafiltration (UF) system Deionized (DI) water system Activated carbon filtration system Ultraviolet (UV) disinfection system