Water quality varies a lot across Prayagraj and Naini, which is why we never sell a purifier on model name alone. Sathvik Electricals supplies Havells RO, UV and storage purifiers at the Havells Galaxy showroom in Naini, Prayagraj, for homes as well as for offices, schools and hospitality where several units go in at once.
The purification type should follow the source. Borewell and tanker water in this region often carries dissolved salts, where RO is the sensible choice. Municipal supply that is low in dissolved solids but questionable on microbes is often better served by UV, and many households end up with a combination. Tell us the source and we will point you in the right direction.
Storage capacity is the second question, and it is decided by peak-hour demand rather than family size on paper. A household of four drinking through the evening, an office floor at lunchtime and a school at break time have very different peaks — undersizing the tank is the usual reason a purifier feels slow.
Filter replacement is the part people forget. Every purifier needs cartridge and membrane changes on a schedule, and the interval shortens with harder water. If you are installing several units across an office or campus, plan the replacement schedule up front so it is budgeted and not discovered mid-year.