Welcome to the Orchid Board! I don't know how it works in India. Does the provider of your municipal water send out periodic reports on its quality and content? Or are you able to request such a report if you want one?
Without knowing the specific properties of your water, it would be impossible for any of us here to offer an opinion, but I would suggest trying to see if you can find out from city officials.
Do you have orchids now, or are you just thinking of getting some? If you have them now, are you using your city water? If so, are you noticing any problems? Remember, though, that if there are any problems with water or any other cultural issue, it could take a long time to actually show up in your orchids.
If you have other questions that we are able to answer, we'll be happy to do so!
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Cheri
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