I always used the regular tap water until our city messed up their yearly maintenance last year. My water started smelling like a swimming pool and the two weeks post maintenance was awful to drink from the fridge’s filter. This year, when the city announced the maintenance, I bought this. It’s like the under the sink Kent RO that we have in India. I won’t go into the installation details with the nanny and I insisting we can DIY(call a plumber) but the RO water is good. This won’t do for apartments but in a home, this is pretty good. Someone did tell me we need to add back essential minerals into the water and this RO system seems to do it. I use this for drinking and cooking. Need to fix one to the fridge (will call plumber for installation).