Why are RO purifiers better than UF?
What happens to the impurities in the RO purification?
Are RO Purifiers better than UF purifiers?
How does RO process work?
How does a UF purifier work?

To understand how RO Purifiers score over UF Purifiers we need to delve slightly into the purification process of both these purifiers.

Lets start with the RO Purifiers first.

In RO Purifiers purification happens following a process of Reverse Osmosis. To understand the process of Reverse Osmosis, let us take a closer look at the Osmosis process. Osmosis is a process in which water molecules flow across a semi permeable membrane – from a region of lower solute strength to a region of higher solute strength. The solute strength in this case refers to the TDS (Total Dissolved & Suspended Impurities) level of water. The water thus in an Osmosis process moves from across the membrane from a region of lower TDS level to the region of higher TDS level

In the RO process the Opposite happens. Hence the name Reverse Osmosis. In this process water is forced to move from a region of higher solute concentration to the region of lower solute concentration. This is achieved by pumping water at a higher pressure inside the RO Chamber causing water molecules to be flow through the membrane to the other side leaving behind dissolved solids and other impurities. The impurities that are left behind are drained out through another outlet. The water that passes through the semi permeable membrane in the RO Purifier has a much lesser concentration of TDS than the original inlet water.

So, when the water has high TDS and is Hard, RO Purification is the most effective

Since the water needs to be pumped at a high pressure to help it pass across the membrane, RO Purifiers will need electricity to perform this task. Hence the RO Purifiers cannot operate without electricity

In an UF or Ultra filtration Purifier, a semi permeable membrane like in case of RO Purifier is used but the holes in the UF Purifier are much larger compared to the holes in the RO purifier and as a result water passes through the UF Filter using the force gravity and without any additional applied pressure. Thus UF Filters work without electricity and should be considered for use where the TDS level of water is low and the water is not Hard