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TDS levels in Kochi range from 100 to 400 ppm, and in Mumbai from 180 to 800 ppm. Bangalore and Chennai have higher TDS in borewell water, ranging from 500 to 1,000+ ppm and 500 to 1,800+ ppm, respectively. The figures show one thing: groundwater TDS keeps changing in every city. As a result, a purifier you use in Kochi may not work in Chennai. As water passes through rocks, it picks up sodium, magnesium, potassium, chlorides, and carbonates.
For areas with TDS below 300 ppm, a standard UV+UF is enough to kill microbes and germs. On the other hand, cities like Bangalore and Chennai need a multi-stage RO purifier to lower the high mineral and salt content. Since urban professionals are changing cities for job opportunities, renting a water purifier has emerged as an alternative to buying one.
Why Every City Has Different TDS Levels
TDS levels are not static because geology changes. Kochi has surface rivers and coastal aquifers; that’s why the water is soft. Mumbai mostly relies on municipal water, with a few areas depending on groundwater.
Bangalore and Chennai have different reasons for high groundwater TDS. Bangalore has depleted groundwater; households drill down 800 to 1,500+ feet to find water. As a result, the water trapped against rock carries calcium and magnesium. In Chennai, massive water deficits and gallons of freshwater pumped from coastal aquifers cause high TDS.
These four cities are shown as examples. Apart from the geological reasons, environmental factors play a role. For this reason, someone using a UV+UF purifier in Mumbai cannot use the same unit in OMR, Whitefield, or any location with high TDS.
Monthly Water Purifier Subscription Emerges as a Solution
According to the Redseer Industry Report (March 2026), the water purifier rental market is expected to grow about 31% by 2030.
India’s working professionals still run to the metro cities for career opportunities. While the high cost of living looms, the ample opportunities inspire them to pursue their big-city dreams. When shifting to a new place, bringing a purifier suited to a different location will not deliver the drinking water quality you need. Buying a multi-stage RO purifier with UV+UF technology costs between ₹11,000 and ₹19,500. Water purifier rentals with comparable features start from ₹391/mo on Rentomojo.
Every time the user shifts base, an uninstallation charge is added. Rentomojo relocates water purifiers for free to the subscriber’s next neighbourhood or city, if the service is available there. Instead of a high upfront cost, renting spreads the amount across months. Subscribers can also choose a tenure that suits a long or short stay.
The Real Cost of Owning a Water Purifier
An entry-level RO purifier costs ₹9,999. Annual maintenance charges are usually not included in the cost. Also, some brands do not cover technician visits. RO water purifiers on rent at ₹391/mo (on a 36-month plan) versus the ₹9,999 ownership cost seem favourable for those likely to stay in the same place for less than 3 years.
Unlike the mid-range brands, Rentomojo’s water purifiers include free filter changes every six months. Subscribers do not need to schedule filter replacements manually.
Using a TDS meter at home is the first step to understanding total dissolved solids. It narrows down the choice between non-RO and RO purifiers. Many people still struggle to know whether they are choosing the right purifier; Rentomojo offers a 7-day free trial.
| Option | 2-year cost |
| Buying a Water Purifier | ₹12,544 |
| Buying on a 2-year EMI | ₹14,110 |
| Renting a Purifier | ₹9,480 (₹395×24) |
Rentomojo’s Range of Water Purifiers in 27+ Cities
Rentomojo, founded in 2014, is a furniture and rental platform with 2,27,000+ live subscribers across 27+ cities. The rental service provider has launched its own purifiers, as well as partner brands, namely DrinkPrime Livpure, Kent, and Urban Company.
Rentomojo’s non-RO purifier starts at ₹292/mo on a 36-month plan. This water purifier can work for water supply below 200 ppm TDS. DriftGo (7L tank) is an RO water purifier with a multi-stage RO system, starting at ₹391/mo on a 36-month plan. DriftPro (8L tank) starts at ₹419/mo and includes alkaline and copper stages, plus an RO+UV+UF system and a TDS controller. During the installation, the technician checks the water TDS before and after.
Furlenco and Cityfurnish also offer water purifier rental in Bangalore, Pune, Mumbai, Hyderabad, and other cities. Rentomojo has its own range of purifiers with filter replacements, free trials, and professional installation.
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