I am living in a few km away from kolkata here the water quailty is preety good and a general water purifier can easily handle little bit of purification very easily.Last year I bought this water purifier from snapdeal after looking at the design which is what attracts many eyes.Firstly the water purifier ran through 3 months without even need of changing the purification catridge.But once the pre installed cartridge ( or bulb) died I bought a new one thinking it should last for atleast 1 and half a month but the water purification stopped just after about 25 days it has a auto shut option which blocks the flow of water once the life span of cartridge is over but in my case it was a new one and the auto shut mechanism blocked it I called the customer care and they said to replace it I ordered a new one and again the same problem after every 20-25 days the same thing happened then a technician from pureit came and temporaily fixed the issue with some plastic caps and other parts after a month again the same problem persists I was really frustrated by this water purifier the indicator on the cartridge never showed that its life span was over but the auto shut mechanism always does so I have stopped using the filter from then and using a different one if the water quality is not very bad at your location try using the pureit classic purifier instead of this one