If you plan to buy a water purifier for home - just dont even think about Ion Exchange - Zero B RO water purifier. Its the wosrt product available in the market. Its only marketing what they are good at. the product is absolutely hopeless.
I had bought A Zero B RO water purifier about 9 months back, but from the day I hv purchased it has given me only trouble & nothing else - sometimes the filter gets spoiled, sometimes the pipes starts leaking & so on. To add to the problem, the afters sales people are the worst you can come across. the product is still under 1 year warranty, but whenever something gets spoiled, the person attending the call will start asking about money for the changed parts, only when you speak to their seniors they agree not to charge.
I really never expected this kind of product & after sales service from Ion exchange.
Verdict - JUST DONT BUY ION EXCHANGE WATER PURIFIERS