Which Water Purifier to Buy in Nepal 2026: RO, UV, UF or Gravity Filter

RO, UV, UF or gravity: what each one removes

Most water purifiers sold in Nepal use one or more of four methods. They are not interchangeable. Each one deals with a different problem, which is why labels like "RO + UV + UF" are so common.

The better RO purifiers add UV as a second line of defence, sometimes inside the storage tank itself, as on the Livpure Platino Plus Copper. Buy RO only if your water needs it. It is the only one of the four that lowers TDS, but it is also the only one that wastes water.

What is TDS, and when do you need RO?

TDS (total dissolved solids) is the amount of minerals and salts dissolved in water. Health Canada lists the main ones as calcium, magnesium, sodium and potassium, with carbonate, bicarbonate, chloride and sulphate. It is given in mg/L, the same number a TDS meter shows as ppm.

The WHO sets no health-based limit for TDS. Its concern is taste, and it rates water like this:

Nepal's drinking water standard allows up to 1,000 mg/L. The WHO also notes that water with extremely low TDS can taste flat, which is why RO purifiers often add a mineraliser.

How to check your TDS

• Use a pen-style TDS meter. It reads electrical conductivity and converts it to TDS, which Health Canada says is the most common way TDS is measured.
• Test the water you will feed the purifier: the tap, the boring line or the roof tank, not bottled water.
• Know what it can't tell you. A TDS reading shows nothing about germs, and arsenic at Nepal's limit (0.05 mg/L) is far too little to move the number. For a boring or tube well, get a lab test for arsenic, iron and coliform bacteria.

When do you need RO?

• Under about 500 ppm, from a treated city supply: UV or UF is enough. Livpure rates its Touch UV purifier for water from 1 to 500 ppm (our listing), and Kent says the Gold Plus UF suits low-TDS tap or municipal water.
• Over 500 ppm, or hard boring water: buy RO. That is above the range UV purifiers like the Touch UV are rated for, and Kent says the Gold Plus is not for borewell or hard water.
• Arsenic above the WHO's 0.01 mg/L guideline, at any TDS: buy RO. Of these four types it is the only one that reduces arsenic. The US EPA says RO can "potentially" remove it, so have the purified water tested too.

Nepal's tap, boring, tanker and tube-well water

These are the limits in Nepal's 2005 National Drinking Water Quality Standards. Recent Nepali studies that cite the 2022 update give the same limits for arsenic (0.05 mg/L) and iron (0.3 mg/L). A figure in brackets is allowed only where no other source is available.

The WHO's guideline for arsenic is stricter: 10 micrograms per litre, or 0.01 mg/L. Here is what Nepali studies and reports have found in each kind of supply.

City tap water (KUKL and municipal supplies)

A common problem with piped water is germs that get in after treatment. After a cholera outbreak in 2024, Lalitpur's Health Office found faecal coliform in 7 of 12 drinking water samples collected around the district; the report doesn't say which sources they came from. KUKL asked people to boil water, saying it can be contaminated by the time it reaches household taps.

What to buy: a UV or UV + UF purifier suits most piped supplies. Check the TDS before you pay for RO.

Boring, jar and tanker water

A study in the Tribhuvan University Journal of Microbiology, covering treated water in the Kathmandu Valley from 2017 to 2018, found total coliform above the standard in 77% of tanker samples and over 92% of jar samples. Iron was above the limit in 15% of tanker samples, and ammonia in 35%.

What to buy: RO + UV with a good sediment pre-filter. Nova Scotia's environment department notes that water high in iron or manganese may need extra treatment before an RO unit, so very muddy or rusty water needs its own filter first.

Terai tube wells: arsenic and iron

By June 2008, blanket testing overseen by Nepal's National Arsenic Steering Committee had covered about 1.14 million Terai tube wells. According to a 2009 Nepal Health Research Council report, 5.6% had 10 to 50 ppb of arsenic, above the WHO's 10 ppb guideline, and another 1.8% were above Nepal's 50 ppb limit. Districts varied widely: earlier surveys summarised in a 2014 study found the share of contaminated wells ranged from 2.1% in Rupandehi to 25.7% in Nawalparasi. The WHO links long-term arsenic exposure to skin lesions and to skin, bladder and lung cancer.

Iron is a known problem in parts of Jhapa. In 2019, The Kathmandu Post reported that groundwater in Kankai Municipality's wards 1 and 2, drawn from tube wells 25 to 35 feet deep, had iron above 8 against a limit of 0.3 (the report gives no unit, and the tests had been done about five years earlier). Residents said the water still smelled after boiling.

In Dhangadhi, a 2025 study of 50 groundwater samples found iron as high as 9.86 mg/L in one shallow source (the paper's abstract gives 9.68), against Nepal's 0.3 mg/L limit.

What to buy: test for arsenic first. If it's there, buy RO + UV. For iron-heavy water, add an iron or sediment filter in front so the RO membrane lasts.

Copper and mineral cartridges: are they worth it?

RO strips most minerals out of water, so many purifiers add a mineraliser or a copper cartridge as a final stage. Livpure says the Copper 29 cartridge in its Platino Plus Copper adds copper to the water. That is a taste and preference feature. The RO membrane and UV lamp do the actual purifying.

The dose matters. Nepal's standard caps copper at 1 mg/L, the WHO guideline is 2 mg/L, and the WHO says copper above 2.5 mg/L makes water taste bitter.

Our view: take copper as a bonus on a purifier that already suits your water. Don't pick a weaker purifier because it has copper. Comparing an NK Copper or any other brand? Ask the same three things: which technology, what TDS range, and what the replacement filters cost.

Filter replacement and running costs

A purifier is only as good as its last filter change. Minnesota's health department warns that treatment units that aren't maintained lose their effectiveness over time. Here is what we can state from sources and our own prices:

Prices checked on 7 November 2026.

Cartridge kits differ by model, so ask us for the right kit and its price before you buy: call 9863609150. Keep the VAT bill too, because it is what lets you claim the warranty. Our guide to why VAT bills and warranty matter in Nepal explains why.

What tank size does your family need?

WHO's 2020 guidance on domestic water quantity recommends at least 5.3 litres per person per day for drinking alone. Allowing a little more for cooking, we size purifiers at about 7.5 litres per person a day (the figure in WHO's older 2003 paper). Remember that the tank is only a buffer: the purification rate and daily limit matter more.

Which water purifier should you buy?

• Low-TDS city tap water, smallest budget: the Kent Gold Plus (Rs 4,850). It is a gravity UF purifier that needs no electricity. Skip it for boring or hard water; Kent says so too.
• Low-TDS tap water, and you want UV: the Livpure Touch UV (Rs 14,875) or the Livpure Glitz DX UV + UF with a 7 litre tank (Rs 16,575).
• Boring or tanker water on a mid budget: the Livpure Touch2000 RO + UV (Rs 25,500), rated for up to 2,000 ppm TDS.
• Best all-rounder for high-TDS water: the Livpure Platino Plus Copper (Rs 31,999). Livpure lists RO + UV + UF with in-tank UV, an 8.5 litre tank, and water up to 2,000 ppm TDS and 450 mg/L hardness.
• No wall space in the kitchen: the Livpure UTC Neon Plus (Rs 34,000) fits under the counter.

Cleaning the air at home too? See our air purifier guide for winter smog. For hot water, read our geyser price and size guide, and for cold nights, our electric heater guide.

Water purifiers in our store

Prices checked on 7 November 2026 on our website; all listed models were available that day. Please call 9863609150 to confirm today's price.

In our store

Livpure Platino Plus Copper

Livpure Touch2000

Livpure Touch UV

Kent Gold Plus

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