I love that their are so many great water filters out their. These are very necessary because filtering out the water in the tap is essential to not only your health but to the way the water tastes. Water Purifiers are multi filtered systems that use stages of filters to remove just about everything that can contaminate your water, however their is a drawback to some of these systems. Some systems remove much needed minerals from the water as well as the contaminants and this can lead to health problems. Your body needs minerals as much as the you need vitamins!