Water Purifier Buying Guide India — RO, UV, or Gravity
Water Purifier Buying Guide India — expert advice on what to look for, common mistakes to avoid, and our recommended picks.
Choosing the right water purifier can be overwhelming with hundreds of options on the market. This guide cuts through the noise and tells you exactly what matters, what to ignore, and how to spend your money wisely.
We have tested dozens of products in this category and distilled our findings into the key decision factors below. Whether you are buying for the first time or upgrading, these guidelines will help you make an informed choice.
For our complete tested rankings, see Best Gravity Water Purifiers in India (2026).
Key Decision Factors
1. Know Your Water Source — This Decides the Technology
The purification technology depends entirely on your input water TDS (Total Dissolved Solids).
| Water Source | TDS Level | Recommended Technology |
|---|---|---|
| Municipal (treated) | Under 200 ppm | UV or UV+UF |
| Borewell (moderate) | 200-500 ppm | RO+UV |
| Borewell (hard) | 500-2,000 ppm | RO+UV+TDS Controller |
| Unknown | Test first | Get a Rs 200 TDS meter |
2. RO vs UV vs Gravity — Not All Water Needs RO
RO removes dissolved salts, heavy metals, and most contaminants but also strips essential minerals and wastes 60-70% water. UV kills bacteria and viruses without chemical taste but cannot remove dissolved solids. Gravity purifiers need no electricity and work on municipal water. Do not install RO if your TDS is under 200 — you waste water and remove healthy minerals for no benefit.
3. Storage Tank — Match to Family Size
Purifier storage tanks range from 5-12 liters. A family of 4 drinking 3 liters/person/day needs 12 liters minimum for daily drinking plus cooking. Tank material should be food-grade, non-toxic, and BPA-free.
4. Maintenance Costs — The Hidden Expense
Filter replacement is a recurring cost. RO membranes need replacement every 12-24 months (Rs 1,500-3,000). Pre-filters every 6 months (Rs 300-800). UV lamps annually (Rs 500-1,000). Annual maintenance contract (AMC) runs Rs 2,000-4,000/year. Factor this into your purchase decision.
5. Mineral Retention — TDS Controller or Mineralizer
RO water at very low TDS (under 50 ppm) tastes flat and lacks minerals. A TDS controller mixes some pre-RO water to maintain 60-80 ppm. A mineralizer adds calcium and magnesium back. Both ensure the water tastes good and retains essential minerals.
Common Mistakes to Avoid
Installing RO when UV is sufficient. If your municipal water TDS is under 200 ppm, RO wastes 60-70% water, removes healthy minerals, and adds unnecessary maintenance costs. A UV purifier is more appropriate and environmentally responsible.
Ignoring maintenance schedule. Skipping filter changes turns your purifier into a bacteria breeding ground. Set calendar reminders for maintenance. Better yet, choose a brand with proactive AMC support.
Buying based on brand ambassador. Celebrity endorsements say nothing about purification quality. Check the actual purification technology, certifications (ISI mark, WQA), and after-sales service network in your city.
You might also find our Best Water Purifiers in India (2026) helpful.
Ready to See Our Picks?
Now that you know what to look for, see which products we actually recommend.
See Our Top Picks →→Frequently Asked Questions
Kent and Aquaguard (Eureka Forbes) lead in RO systems with the widest service networks. Pureit (HUL) offers good value in UV and gravity segments. LivPure and KENT are strong in the Rs 10,000-15,000 range.
Purchase: Rs 8,000-20,000. Annual maintenance: Rs 2,000-4,000. Total first-year cost: Rs 10,000-24,000. Subsequent years: Rs 2,000-4,000/year for filter replacements and servicing.
RO water with TDS maintained at 60-100 ppm (via TDS controller) is safe. Very low TDS water (under 30 ppm) can leach minerals from the body and is not recommended for infants. Always check output TDS.