What are the benefits of the reverse osmosis water filter

What are the benefits of the water purifier,reverse osmosis water filter,RO water system......
First:The reverse osmosis water filter solving the secondary pollution of tap water,after the water from the reverse osmosis,it is pure water,it is we can drinking directly it is safe water.
In daily life,Most of the peoples think that boiling tap water can kill all bacterias,drinking the water like this is absolutely safe,actually this is a wrong view.
Because after the tap water is piped long distances,susceptible to secondary pollution,and also boiling the tap water ,just can kill bacterial virus only,but it is can not remove the heavy metal,sand,dirt,worn and rust particles,it is can not bsorb the chlorine,VOC Organic matter,odor,smell turbidity in the water,also it is can not remove the salt,bad mineral substance and sissolved matter and chemical in the water.
Normally the 5 stage reverse osmosis water filtration (RO water filter system).About the reverse osmosis system are including:Industrial water purifier plant(RO system plant)Domestic household water filter and sea water desalting plant.
Such as, the household (home) reverse osmosis with 5 stages,each stage will have thier are own function:
1stage is 1um PP sediment filter cartridge:It remove sand,dirt,worn and rust particles.
2 stage is GAC-Granular activated carbon filter:it is absorb the chlorine,VOC organic matter,odor,smell turbidity
3 stage is CTO-Granular activated carbon filter:it is absorb the chlorine,VOC organic matter,odor,smell turbidity
4 stage is Ro Membrane:The membrane with 0.0001um filtration precision for separating and removing the bacteria and virus,heavy metal lons,salt,bad mineral substance and dissolved matter and chemical 

5 stage is T33-Post carbon filter:It is absorb the odor,and adjust the taste of the water