Buying guide
A TDS controller — Aquaguard calls it MTDS, KENT calls it a TDS controller — blends a small, adjustable amount of unpurified (but UF-filtered) water back into the RO output. The purpose is to put back some of the calcium and magnesium that reverse osmosis strips out, so the water tastes like water instead of tasting like nothing.
This matters more than most buyers realise. RO output at 20-30 ppm is technically pure and genuinely unpleasant to drink — flat, slightly metallic, and the reason many people say purified water 'tastes wrong'. Blending back to 60-120 ppm produces water that tastes clean and full.
It also future-proofs your purchase. If your supply switches between municipal water in the monsoon and tanker water in summer — normal in Bengaluru, Gurugram and Chennai — a fixed-ratio purifier will over-strip in one season and under-purify in the other. A TDS controller lets you adjust.
Hot water on tap, and the best water recovery in the category
The default recommendation for Indian borewell water
Aquaguard's best-selling all-rounder, now with active copper
AO Smith engineering without the hot-water premium
Copper plus alkaline in Aquaguard's premium domestic unit
Hot and ambient dispensing at a sane price
Counter-top KENT with a UV-sterilised tank
HUL's copper RO with an enforced filter-life cut-off
High-throughput KENT for large families and small offices
Pureit's premium unit with a smart-sensing display
| # | Product | Price | Score | Max input TDS | Best for |
|---|---|---|---|---|---|
| 1 | AO Smith Z9 Green RO | ₹33,990 | 9/10 | 3000 ppm | Premium kitchens, high-TDS or brackish supply, and households that drink a lot of tea and coffee. |
| 2 | KENT Grand Plus | ₹16,499 | 8.9/10 | 2000 ppm | Families on borewell, tanker or high-TDS municipal supply who want the safest all-round choice. |
| 3 | Aquaguard Delight NXT | ₹17,990 | 8.7/10 | 2000 ppm | Buyers who value service reliability and compact design over maximum tank capacity. |
| 4 | AO Smith X7 | ₹23,490 | 8.6/10 | 2000 ppm | Buyers who want AO Smith's engineering and water efficiency but do not need hot water. |
| 5 | Aquaguard Aura | ₹25,490 | 8.5/10 | 2000 ppm | Premium buyers who want copper and alkaline options in one well-built unit. |
| 6 | Havells Aqua S | ₹21,490 | 8.5/10 | 2000 ppm | Buyers who want hot water on tap without paying premium-brand prices. |
| 7 | KENT Pearl RO | ₹17,990 | 8.4/10 | 2000 ppm | Renters and anyone who cannot drill walls, but still needs full high-TDS RO purification. |
| 8 | Pureit Copper+ RO | ₹15,999 | 8.4/10 | 2000 ppm | Safety-first households, and anyone who has previously forgotten filter changes. |
| 9 | KENT Prime TC | ₹15,490 | 8.3/10 | 2000 ppm | Large households and small office pantries that need volume more than features. |
| 10 | Pureit Marvella RO | ₹20,990 | 8.3/10 | 2000 ppm | Buyers who want Pureit's safety philosophy in a better-finished, better-instrumented package. |
Prices are indicative street prices, last verified 2026-08-01. Always confirm the current price on the marketplace before purchasing.
Free consultation · Pan-India
Tell us your city, your water source and your budget. For homes we will recommend the right technology — including telling you when a ₹3,000 purifier is genuinely enough. For offices, societies and factories, our team will size a system against your water report and send a specification-backed quotation.
Or email betterworkindia@gmail.com — attach a water analysis report and we can quote faster.
Homes
Right-sized recommendation for your TDS, not the most expensive unit
Offices & societies
25 LPH to 2,000+ LPH, sized on headcount and feed water
Industry
Pharma, food, textile, boiler feed — engineered to your specification
Service & AMC
Installation, repair and AMC with written response times