Looking for some advice. Iím going to get a whole house point of entry carbon filter. Iíve read differing opinions on add on products, specifically a reverse osmosis single point of use system for the kitchen sink where youíre most likely to get your drinking water from. This seems like overkill to me, but Iím no expert. Does anybody have this specific setup or just a whole home carbon filter that cares to comment on this and what type of costs/upkeep there is post installation.