I was told....not sure how true.....but Britta only removes setament and clorine. Not the other potentionally harmful stuff.
I use a reverse osmosis system myself. It has been approved to remove just about everything including nitrates. Ours was on the high side of normal when we bought the house and we have small children so nitrates could be a problem. We opted to have one put in. I am ssoooo pleased with it. We paid about $375.00 for it. But it was truely an investment.
I don't have any setament or "junk" in our drinking water. No poisons or whatever....nitrates, iron, arsnic, and such. The things that they test for.