Do You Need an RO Water Purifier for Borewells in Delhi?

An RO water purifier is usually the top choice for drinking water in Delhi households that rely on a borewell. Groundwater and borewell water sources in Delhi usually have high TDS. As a result, they contain heavy metals and salts, and a basic UV filter cannot remove dissolved minerals. To know whether you need an RO purifier in Delhi, use a TDS kit to measure your tap water quality. A handheld TDS meter will give you a basic idea of whether your water’s TDS level is high. 

Also Read: Water TDS Level in Delhi: Safe Limits and the Right Purifier

Why Do Borewell and Tanker Water in Delhi NCR Need an RO Purifier? 

Many households rely on borewells. Again, when municipal water is in short supply, many families in South Delhi, Noida, and Gurgaon switch to a borewell or private tanker. As it passes through, groundwater carries salts and minerals from the rocks. As a result, the water has high total dissolved solids. This increases the water’s hardness. 

With tanker water, it is difficult to judge whether it will be hard. If the source is disclosed, the chances are low. However, most tanker water suppliers do not disclose the source and may also rely on borewell water. 

Is the TDS Level High in Noida and Gurgaon Water? 

Water hardness and high TDS depend on the water source. If your household relies on municipal supply, you’ll likely get soft water. Common signs of hard water include white scales on buckets, kettles, or utensils. You may also find it hard to wash shampoo out.

According to India’s drinking water standard, IS 10500, 500 mg/L is considered the acceptable limit for TDS. UV and UF water purifiers can remove germs, but they don’t work at high TDS levels. RO water purifiers can reduce TDS in Delhi NCR. 

Also Read: Can You Reuse RO Waste Water? 6 Ways To Use Reject RO Water!

How Do RO Water Purifiers Work in Delhi’s High TDS? 

RO water purifiers run through these stages to deal with the high TDS levels in water: 

1. A sediment pre-filter can trap sand, silt, and clay before they reach your tap water.
2. Activated carbon eliminates chlorine, organic compounds, and odour.
3. A high-TDS RO membrane works to remove dissolved salts, hardness, and dissolved metals.
4. A UV/UF filter is a second barrier against viruses and bacteria.
5. The TDS controller adjusts the final TDS to ensure the water does not taste flat.
6. Mineral cartridge adds back minerals lost during RO purification. 

RO Membrane’s Maximum TDS Rating Explained 

Every RO water purifier is rated for a maximum input TDS. If the feed water is above that rating, the output TDS goes up, and the membrane wears out faster. You can check the ‘maximum supported TDS’ on the specification list against a reading of your own water. For example, Rentomojo shows 2,000 ppm on the product page for DriftGo and DriftPro.

TDS Controller for RO Purifiers 

TDS controllers function by adding a small amount of filtered water that has not passed through the RO membrane. This can slightly elevate TDS and bring back the taste. If the input water TDS is high, a small turn of the valve can quickly increase the output water TDS. 

Also Read: Best Water Purifier for Home in Delhi (2026): A Complete Guide

Do RO Filters Clog Borewell and Tanker Water? 

A choked RO membrane is the most common issue with borewell and tanker water. It happens for the following reasons: 

1. Sediment: Sand, silt, and clay can choke the pre-filter, and then the effect is on the membrane – only if the pre-filter has not been changed for a long time.
2. Iron: Dissolved iron reacts with air and forms a rusty deposit that adds a layer on the membrane.
3. Hardness: Magnesium and calcium create a layer of scaling on the membrane surface. 

If you notice the flow slowing, it may be a sign. Storage tanks take longer to fill, and the output TDS keeps increasing. RO membrane is an expensive component of the purifier, and changing the pre-filters keeps maintenance costs lower.

Does RO Remove Iron and Hardness from Water? 

Yes, an RO membrane eliminates dissolved iron, calcium, and magnesium along with other salts. RO water purifiers can handle hard water in Delhi. However, high iron is an exception because it affects the membrane over time. You can check the manual to see the maximum input of iron the RO purifier can handle. An iron filter sometimes works well with the purifier. 

How Often Should You Replace an RO Membrane? 

There is no fixed schedule for replacing the RO membrane. It depends on input TDS, hardness, sediment, iron, and how much water a household uses. It wears out faster on hard borewell water than on municipal water supply. Replace the membrane if output TDS remains high or flow is low after replacing the pre-filters. 

Should You Buy or Rent an RO Water Purifier for Hard Water? 

For borewell water, the purchase price is the only starting point. You need to change the pre-filters and membranes because iron-rich, silty, hard water can wear out the filters faster. Each replacement requires a technician visit. Technician visits cost a few thousand rupees, and with hard water, the bill keeps coming back. 

Here’s how renting an RO purifier compares to buying one: 

Which Rentomojo RO Purifier Suits Borewell and Tanker Water in Delhi? 

Rentomojo, a furniture and appliance rental platform established in 2014, offers RO water purifiers on rent in Delhi NCR.

Note: The prices are as mentioned as of 5 October 2026. The latest pricing appears on the Rentomojo website and app. 

For Rentomojo’s water purifiers, all plans include annual maintenance, repairs, and filter changes (every six months). For borewell or tanker water up to 2,000 ppm, the DriftGo and DriftPro are the closest fit, and the DriftPro adds alkaline and copper stages. The RM Premium suits water up to 1,500 ppm and keeps stored water disinfected with in-tank UV.

Also Read: Buying an RO vs RO on Rent in Delhi: AMC, Filter Changes

Final Thoughts 

If your water is above 2,000 ppm, none of these water purifiers will make a significant difference. You should have your water tested at a lab because mixed tanker water and borewell water can start showing changes in quality from one month to the next. When your reading is above 2,000 ppm, your household water purifier will not be enough. So, test your tap water before deciding on a water purifier. Rentomojo lets you upgrade your RO water purifier on rent in Delhi if your home needs change. Visit Rentomojo today for the right water purifier rental in Delhi!

Frequently Asked Questions 

1. What water filter is best for hard water? 

An RO system is the best choice for removing total dissolved solids from drinking water. It removes dissolved calcium and magnesium minerals. For the whole house, you can consider an ion-exchange water softener. 

2. Can a water purifier purify hard water? 

Yes, an RO water purifier purifies hard drinking water by eliminating dissolved calcium and magnesium minerals. A carbon or sediment pre-filter cannot remove dissolved solids. 

3. What is the best treatment for very hard water?

The best option is to install an ion-exchange water softener at the main water inlet. The system passes incoming water through a resin bed loaded with sodium and potassium ions. 

4. Is RO water safe to drink in Delhi?

Yes, RO water purifiers are safe for drinking water in Delhi. Make sure to get a purifier with a TDS controller to keep the mineral levels balanced.