http://www.housewaterfiltersystem.com/robots.txt Water filters remove things that are harmful to your health, things that can increase the chance of getting cancer, and things that taste or smell bad. The physics of filters is based on sieving, ion exchanges and other processes. Pur and Brita are two well known brands. Today, whole house water filters are available aswell as portable and refrigerator systems. http://www.housewaterfiltersystem.com/robots.txt/?article=20100908-75 A screen filter is a type of filter utilizing a rigid or flexible screen to separate sand and other fine particles out of water for irrigation or other applications. These are generally not recommended for filtering out organic matter such as algae, since these types of contaminants can be extruded [read more online] http://www.housewaterfiltersystem.com/robots.txt/?article=20100908-79 A Water Ionizer is an appliance that ionizes water through a method of electrolysis. Major water ionizer manufacturing companies (e.g Jupiter Dong Yang Science) claim that consumption of alkaline water with a lower ORP and higher oxygen content may improve health. There are many nutrition experts th [read more online]