The carbon filter must be replaced more often. This system wastes a lot of water 25-60 gallons per day depending upon the level of water use. Distillation Water is boiled and steam is collected and condenses into clean water in a storage tank. Some beneficial minerals along with the contaminants are removed. Also, this system is slow and requires alot of electricity.
Chlorine is a commonly used oxidant.
Chlorine may react with naturally occurring organics in the water to form a class of carcinogens known as trihalomines. If not applied at sufficient levels, this method only retards the growth of bacteria and viruses. Consumer s Report tested 27 widely used home water filter treatment systems and published the results in its August 1997 issue. Each system was tested in terms of its efficacy in removing chloroform, an organic compound, and lead, a heavy metal. The article also gave estimates of annual operating costs for each system.