RO and UF Purification

What is the difference between RO and UF purifier?
What are RO purifiers based on?
Which is more better, RO or UF purifier?
What is the comparison between RO and UF purifier?
Can UF purifier remove dissolved salts?

The Purification by RO and UF are based on membranes. But the difference between the two is in the size of the pores in of their membranes. In an RO membrane the filtering pores are so small that it can even filter out salt molecules from the water. In the UF membrane the pores are larger and so it cannot filter out salt molecules.
Though the UF membrane is capable to filter out viruses from water, it cannot filter out the salts and metals from the water.

The advantage of the UF water purifier is that it works without electricity whereas RO Purifier requires electricity and hence is expensive compared to UF purifier. Other than the extremely small particles of salts the UF filter can filter out all other physical imppurities and is sure to filter out any disease causing germs, including the smallest of viruses. The UF membrane is also so small that it can filter out all dust and other particles and make the water safe to drink.

The only problem with UF water purifier is that in case any harmful dissolved salts are present in the water the UF membrane cannot filter it out. Only an RO water purifier can filter out harmful dissolved salts from the water. That is why the RO water purifier is considered superior to an UF water purifier.