In order to know which water purification system or under sink water purifier to buy you have to start by looking at your local water quality report. You want to buy the whole house water purification system or kitchen water purifier (or both) that removes the contaminants in your water. Most people make a huge mistake by not doing this. Just buying a filter does not protect you! It has to be the right one for your situation. Buy best kitchen water filters at Clean Air Pure Water.
