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Which is the best RO water purifier in Ahmedabad?

That sounds great! Is there anything else you can tell me about its maintenance or filter replacement?
Yes, the AO Smith Z9 comes with a filter change alert and has an automatic flush process to ensure the longevity of the RO membrane. The pre-filter and sediment filter are recommended to be changed every six months, while the RO membrane and post-carbon filter are recommended to be changed once a year. AO Smith also provides a replacement service for filters and other parts.