I have had one of these 5 stage reverse osmosis water filters in our apt since we bought it, never had any problems, just change the filters every year, can be easily bought from DIY shops, good clean water, removes all taste etc. the only difference is that it just supplies water to one tap on our kitchen sink, not sure how you would fit a whole house one as you would need to see where the main incoming pipe is, don't think they are under the sink as back in the uk.