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Things are different now. With hundreds of harmful chemicals, pesticides, surfactants, heavy metals added everyday in our natural drinking water resources; a whole house carbon filter would just not be enough.
It can very well take care of the difficult chemicals like chlorine and chloramines but is completely ineffective for other types of water contaminants like micro-organisms and heavy metals. In fact, as per their data, every year more and more tough contaminants are getting added to the Contaminant Candidate List (CCL) maintained by the EPA. These are the candidates which may require regulation under Safe Drinking Water Act (SDWA) in the future. With this number increasing every day, what you really need is an advanced water purification mechanism which can take care of all these different types of impurities organic, inorganic, chemical, synthetic etc.
Typically, expecting any one purifier to handle all these types of contaminants is a little too much to ask for.
There is no filtration technique which alone can handle such varied types of impurities. But, there is an easy and smart solution available to this problem. This solution is available in the form of a whole house multi-stage water purifier.
Such a system essentially comprises of more than one filtration unit, each employing a different filtration technique. The first unit is mostly the old, favorite and effective whole house carbon filter which can take care of chlorine, chloramines, cysts, parasites etc. The second unit typically is a sub-micron filter or an ion exchange unit which takes care of removing unwanted minerals and heavy metals from the water. Moreover, this filtration is extremely selective and smart in nature.
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Source: (whole house carbon filter) http://whole-house-water-filters-reviews.com/whole-house-carbon-water-filter/