The TNT System is not a water softener where salt is added to water. The TNT System is a four stage filtration system versus other systems that use only a single stage filtration media. The TNT System removes numerous contaminants that other systems do not address. With TNT's multi-stage system, each filter has a vital role in the process of filtration that produces the de-ionized water, resulting in a spot free wash. In the TNT System, the first two filters remove the bulk of chemicals and solid contaminants and the final two filters remove all common ions (both positive and negative) to produce an ultra pure water that is (pH) balanced. In addition, no electrical hook up is required.