Archive · 5 Sep 2026
Why Water Testing Should Come Before Buying A Purifier
A water purifier should be chosen based on what is actually wrong with the water.
A TDS meter gives one useful clue, but it does not identify every dissolved substance.
It also cannot show whether bacteria or viruses are present.
High TDS may mean that RO is useful, but testing can provide a clearer answer.
Bad taste does not always mean that RO is needed.
Carbon filters may help with chlorine and some smells.
Borewell water can be different from one home to another.
RO, UV, UF and carbon filters each do different jobs.
The best purifier is the one that solves the specific problem in your water.
A high TDS reading alone does not prove that reverse osmosis is necessary.
TDS indicates dissolved substances but cannot identify them or detect bacteria and viruses.
Bad taste or odour may result from chlorine, minerals, plumbing or storage, and may be improved with carbon filtration.
Borewell water varies by location, depth and geology, so its source alone cannot determine the right purifier.
Buyers should compare purification needs, maintenance costs, water recovery, service availability and replacement parts.
- Who
- Households choosing water purifiers, especially those using borewell or uncertain water supplies.
- What
- The article explains how to assess water quality and select purification technology instead of automatically buying an RO purifier.
- When
- Before purchasing a water purifier and during ongoing ownership-cost comparisons.
- Where
- In homes using municipal, borewell, tanker or combined water supplies.
- Why
- Because TDS, taste and water source alone do not fully identify water-quality problems, and purifier technologies have different purposes and costs.
- TDS limitation
- A TDS reading shows the concentration of dissolved substances but does not identify them or detect bacteria and viruses.
- RO function
- Reverse osmosis can reduce many dissolved substances and may be relevant for high dissolved solids or specific dissolved contaminants.
- UV function
- Ultraviolet treatment is aimed at microorganisms and does not remove dissolved salts in the same way as RO.
- UF function
- Ultrafiltration physically filters certain particles and microorganisms but does not provide the same dissolved-solids removal as RO.
- Carbon filtration
- Activated carbon can reduce chlorine and improve taste and odour, while helping with certain organic compounds.
- Borewell variation
- Borewell water can differ according to location, geology, source and depth, and may contain varying levels of hardness, fluoride, nitrate or iron.
- Ownership costs
- RO ownership can include replacement filters and membranes, servicing, electricity and water rejected during purification.