FilterMaster OSMOPower 2.0 is a professional and complete 3-stage reverse osmosis unit for aquariums. The system supplies soft, high-purity water and removes pollutants, hardeners, viruses, bacteria and other undesired substances from tap water - which is essential for the adjustment of species-appropriate water values for freshwater and seawater aqauriums.The functional principle is the so-called reverse osmosis:The tap water is pushed through a special membrane with ultra-fine pores using the pressure in the domestic water supply pipe. Due to the small size of these pores, only the small water molecules fit through it. However, the bigger pollutant molecules, hardeners and salts are filtered out. Even bacteria and viruses are removed. The result is a very soft, high-purity water.FilterMaster OSMOPower 2.0+ 3-stage compele system+ 1. Layer: fine filter with 5m filter structure to keep out suspended solids+ 2. Layer: activated carbon filter removes pesticides, herbicides and chlorine