Almost every new RO purifier now advertises “copper”, “zinc” or “alkaline” stages. Are they worth paying for, and which one should you choose? Here is a simple, honest explanation.
Why these stages exist
RO removes most minerals, so RO water can taste flat and have a slightly lower pH. Copper, zinc and alkaline cartridges sit after the RO and add a small amount of minerals back to improve taste. Read more in pH of drinking water.
Copper vs zinc vs alkaline
| Stage | What it adds | Main benefit |
|---|---|---|
| Copper | Traces of copper (inspired by drinking from copper vessels) | Taste; traditional preference |
| Zinc | Traces of zinc | Taste |
| Alkaline / mineral | Calcium, magnesium and similar minerals; raises pH | Better taste, pH back to normal range |
| Combined (Zinc + Copper + Alkaline) | Mix of the above | Most common in new purifiers |
The honest truth about health claims
These stages add only small amounts of minerals. They improve taste and help keep pH comfortable – but claims that they cure diseases are not backed by reliable evidence. Your diet is the main source of minerals. See alkaline filter in RO – myths and facts.
Which should you buy?
- Buying a new purifier? A combined zinc + copper + alkaline model costs little extra, e.g. OMEGA Pro+ Luxury (₹4,900) or STARLINK (₹5,500).
- Already have an RO? Add an inline cartridge: Zinc Copper Mineral 5-in-1 (₹175), Blue Mount BM3 Copper Shell (₹295) or Bio+ Alkaline (₹175).
- Replace these cartridges every 6–12 months – their effect fades with use.
See all alkaline and mineral filters and RO purifiers.
Frequently asked questions
Is copper RO water safe?
Yes. The amount of copper added is small. Replace the cartridge as advised.
Can I add an alkaline filter to my old RO?
Yes, an inline cartridge fits after the tank with push-fit connectors.
Does an alkaline filter increase TDS?
Slightly, as it adds minerals – usually a small rise.
Need help choosing the right part? Send a photo of your RO or its model name on WhatsApp (96252 23245) and we will tell you exactly what fits. Original parts at wholesale rates, Cash on Delivery and All India delivery.
Need the right part for your RO?
Original filters, membranes and pumps at wholesale rates. Send us a photo of your RO – we will tell you exactly what fits.
