In all honesty, the idea of the best water purifiers is not really applicable. Water all over the world has different chemical additives or different microorganisms in it, so no single water filter can get them all. To know what are the best water purifiers, you have to consider what is in your water and how you want to get rid of it.
In the carbon filtration method, water passed through carbon filters gets rid of unpleasant tastes, smells, chlorine, gases, and many chemicals. Occasionally, this method gets rid of micro-organisms. This pure water technology will not have an effect on hardness of water, heavy metals and solids absorbed in water. The collected after this method of filtration can be bettered by filtration using another method.
Residential reverse osmosis systems are much more expensive than multi-stage selective filtration devices. The multi-stage filtration devices are actually more effective providing more than one way to filter your liquid. Reverse osmosis pure systems for residential areas are less complicated versions of the systems that treat rivers and lakes in rural areas. However, the technology itself is dead and should be phased out in favor of more effective and more cost effective methods of pure home water filtration.
One of the best water purifiers when it comes to removal of microorganisms is ultraviolet filtration. The microorganisms in the water are inactivated when the DNA and proteins of their cells absorb ultraviolet radiation. There are several different ultraviolet water filtration systems out there and it continues to expand with its increasing popularity. These filters can filter out contaminants that cause foul tasting water. There are also UV sterilization lamps that can filter water.