Brand: AO Smith
RO + Alkaline + Copper water purifier
Our editorial score
Good — right for the specific buyer
A small household on borewell, tanker or high-TDS municipal supply
Catalogue listing — not a hands-on review
We have not tested this unit. The specifications below are parsed from the manufacturer's own listing, the features are their wording, and the score is calculated from those specifications rather than assigned by an editor. For models we have examined in depth, see our ranked water purifiers guides.
The AO Smith X9 Black is a RO + Alkaline + Copper water purifier listed by AO Smith at ₹21,000. That is above the ₹17,990 median for the purifiers in this catalogue.
AO Smith publishes little machine-readable specification for this model beyond the purification technology, so the specification table here is deliberately short rather than filled with estimates.
Every figure here is AO Smith's own published specification, read from www.aosmithindia.com on 20 September 2026. This is a catalogue listing, not a review — nobody here has used this purifier, and the score is calculated from the published specs by the method printed on the water-purifier hub. Running cost is a category estimate, not the maker's figure. Check the Amazon and Flipkart links before buying.
Every condition below is derived from this product's published specifications and from how it compares with the water purifiers we track — so you can check each one against your own room, supply or budget rather than take our word for it.
Your supply runs above 2,000 ppm TDS
The membrane is rated to 2,000 ppm. Feed it more and it will not fail dramatically — it will die early and quietly, and you will be buying membranes annually. Check your worst-season reading, not your average one.
Purifiers for high-TDS supply →Water wastage matters to you
The brand does not publish a recovery figure, so there is no way to know how many litres go to drain per litre purified. Only 2 of the 26 water purifiers we track publish this at all.
High-recovery purifiers →You live outside a metro or a major service town
AO Smith's service network is rated good rather than excellent. Filter availability and callout times are what decide whether a purifier is still running in five years, and they are worth checking for your pin code before you buy.
How we score service reach →Fair transparency. This is separate from our review score above — it measures how well documented, how supportable and how expensive to own this water purifier is, scored on 4 of 7 axes by formula, with no manual override. See the methodology.
| Axis | Score | Weight | Based on |
|---|---|---|---|
| Documentation | 3.3 | 15% | 4 of 12 tracked specs published |
| Running cost | 7.1 | 20% | ₹3,000 per year |
| 5-year cost of ownership | 6.9 | 20% | ₹36,000 over five years |
| Warranty & free service | Not scored | 12% | Not published |
| Service & parts reach | 6.0 | 15% | AO Smith service network rated good |
| Energy efficiency | Not scored | 8% | Not published |
| Water recovery | Not scored | 10% | Not published |
| Purification | RO + Alkaline + Copper |
|---|---|
| Suitable for | Borewell, tanker and high-TDS municipal supply |
| Estimated running cost/year | ≈ ₹3,000 |
| Variants listed | 1 |
Specifications are from manufacturer literature and were checked at the last price-verification date. Brands occasionally revise stage counts, tank sizes and warranty terms without changing the model name — confirm against the current listing before purchasing.
An American water-heating giant that brought serious engineering to Indian purifiers. AO Smith's Z-series is the benchmark for hot-water-on-tap RO, and its Advanced Recovery Technology genuinely delivers better reject ratios than most competitors. Premium pricing, premium build.
Tip
KENT
Families on borewell, tanker or high-TDS municipal supply who want the safest all-round choice.
View details
Aquaguard
Buyers who value service reliability and compact design over maximum tank capacity.
View details
AO Smith
Buyers who want AO Smith's engineering and water efficiency but do not need hot water.
View details
Aquaguard
Premium buyers who want copper and alkaline options in one well-built unit.
View detailsFree 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