My wife would love that. She adds some lime to her water all the time.... or lemon, depending upon her mood!

Maybe that's where they get the water for Diet Coke with Lime.

The mineral, not the fruit.

http://en.wikipedia.org/wiki/Lime_(mineral)

And getting completely off topic...

I absolutely cannot stand the lemon & lime coke/diet coke mixes. I agree that a bit of fresh lemon or lime juice does add a nice component to coke/diet coke. But their canned stuff, blech. It's about the worst tasting chemical substitute for lemon/lime flavor ever. Tastes like pine-sol to me. Don't ask how I know what pine-sol tastes like.

How do you know what pine-sol tastes like?

Wow, you just went there.

Oh no he di'int!

Mostly, activated charcoal is what it is.

The under-sink models have a big advantage over the faucet-end types in that they last a LOT longer. Just get whatever type of cannister they have at the local Blowe's or HD.

An under-sink unit typically requires another hole to be drilled and another spigot, right? Something of a hassle with a stone counter :-/

I had a whole-house coconut-shell-carbon filter at my old place. Did a great job of filtering HS out of the well water, but needed periodic replacement. I'm on city water now, which smells like ass. There's a small filter inside my fridge, but the tap is also inside, not on the door, which makes it rather inconvenient. I'm tempted to have bottled stuff delivered so I can have a crock dispenser in my office -- I telecommute and for medical reasons need to drink copious amounts of water.

I would think they make under sink filters that connect to your existing line as well.

Sure, I was thinking having the filter for all the cold water going to the kitchen faucet. Wears out faster that way, but easy and elegant installation.