Other systems remove only dissolved solids from the water supply, uniquely the Zero removes both dissolved solids and all organics as well as bacteria from the water supply. The result is not only water that is 1,000 times purer but also ultra pure water that is free from micro-organisms such as legionella bacteria and the organic matter that bacteria feeds upon. A significant benefit is that bio-film cannot form upon the surface of filter media or the RO membrane that means that filters maintain day one performance which in turn means lower running costs