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I researched this as well recently. I wanted filtration mainly for lead since I know that my home has a lead service line and thought I might get whole house filtration if it was feasible. Well, I discovered that whole house filtration is primarily for sediment reduction, water softening and aesthetics (taste/color) and I basically didn’t find any whole house system that filtered heavy metals.
From my research, I settled on a Multipure Aquaversa undersink filter in the kitchen. I may eventually add a filter in the bathroom as well, but I don’t usually use the bathroom sink for drinking water.
If heavy metals and volatile organic compounds are a concern, you should look for a filters that meet NSF/ANSI standard 53. Many of the popular water filters on the market (and most on the shelves in the stores I checked) only meet NSF/ANSI standard 42 – which is primarily for aesthetics (taste/color).
NSF/ANSI Standard 42: Drinking Water Treatment Units – Aesthetic Effects
Overview: This standard covers point-of-use (POU) and point-of-entry (POE) systems designed to reduce specific aesthetic or non-health-related contaminants (chlorine, taste and odor, and particulates) that may be present in public or private drinking water.
NSF/ANSI Standard 53: Drinking Water Treatment Units – Health Effects
Overview: Standard 53 addresses point-of-use (POU) and point-of-entry (POE) systems designed to reduce specific health-related contaminants, such as Cryptosporidium,Giardia, lead, volatile organic chemicals (VOCs), MTBE (methyl tertiary-butyl ether), that may be present in public or private drinking water.