Choosing a purifier starts with knowing your water source and its TDS.
RO (reverse osmosis)
Pushes water through a fine membrane that removes dissolved salts and many contaminants. Best where TDS is high — typically borewell or tanker water.
UV (ultraviolet)
UV light inactivates bacteria and viruses. It does not remove dissolved salts, so it suits water that is already low in TDS but may carry germs.
UF (ultrafiltration)
A membrane with larger pores that removes suspended particles and many microbes without electricity. It does not reduce TDS.
Combination purifiers
Many purifiers combine RO + UV + UF so one unit can handle changing water quality. A TDS controller blends a little treated-bypass water back to keep taste pleasant.
How to decide
- TDS above ~500 mg/L: choose RO (RO + UV or RO + UV + UF).
- TDS below ~300 mg/L, municipal water: UV or UF can be enough.
- Water source varies: choose a multi-stage purifier.
Quick answers
Is RO water good for daily drinking?
RO purifiers with a TDS controller or mineraliser are designed for daily drinking. Choose a model suited to your input water.