Few months back I noticed that my water-purifier was not functioning properly. We thought to replace it with a RO one and called few representatives to check water and recommend a suitable water purifier for us. To my horror the TDS and water Hardness were much above the suitable consumption limits. In Bangalore were most of the place do not have access to the Kaveri water depending on groundwater is the only option. Here groundwater is very very hard and not at all suitable for consumption so a Ro water purifier becomes a necessity. We got a Ro installed and would recommend to get your water checked if you are dependent on groundwater.