Home appliances
Buying RO when your water is already low-TDS strips minerals and wastes litres. Buying UV when your borewell water is hard leaves you drinking salts. The correct purifier is decided by one test, not by the salesman.
A few questions about your situation, not about the product.
Answer all 4 questions to see the spec sheet to shop with.
How many dissolved salts and minerals are in your water, in ppm.
Why it matters
Below ~200 ppm you usually need only UV/UF. Above ~500 ppm you need RO. This single number picks your machine.
What to check
Get your actual supply tested — a ₹100 TDS meter or the society's report is enough.
RO removes dissolved salts; UV kills germs; UF filters cysts and mud without electricity.
Why it matters
Each handles a different problem. Municipal water usually needs UV+UF; borewell and tanker water needs RO.
What to check
RO on already-soft water tastes flat and wastes 2–3 litres per litre purified.
A control that adds back some minerals after RO.
Why it matters
Keeps taste and essential minerals when TDS input varies (tanker one week, municipal the next).
What to check
'Copper' and 'alkaline' stages are mostly taste and marketing — they don't replace correct filtration.
How much purified water it holds and how fast it makes more.
Why it matters
In areas with power cuts or timed supply, a 7–8 L tank matters more than any fancy stage.
What to check
Tank material — food-grade plastic vs stainless. Plastic tanks need cleaning every 6 months.
Litres of drinking water per litre of reject water.
Why it matters
Old RO units waste 3:1. Newer ones manage 1:1 and can route reject water to a bucket.
What to check
Ask for the recovery rate and whether the reject line can be diverted for mopping.
How often cartridges and the RO membrane are replaced, and what a service contract costs.
Why it matters
Filters are the real cost of ownership — often 30–50% of machine price every year.
What to check
Ask for the printed price list of each cartridge and membrane before buying.
Entry UV/UF units to premium RO+UV+MTDS with copper or alkaline stages.
