In 2010 the Scientific Services Laboratories located near Middletown, NY, was funded by the WQA to
complete two comprehensive case studies to determine the
effects that hard water has on household soaps, detergents & laundry washing. These two studies investigated stain removal properties on clothes &
the effectiveness of detergents in dishwaters with an additional focus on spot & film evaluation.
The studies conclusively proved that a reduction in water hardness alone is up to 100 times more effective at removing certain stains from clothes then by increasing detergent dosage or water temperature. This was stated as being "The most significant conclusion of the study."
The laundry study concluded that switching to softened water will improve laundry cleaning performance & help decrease your combined energy & detergent
bills by at least 50%. This is true for both top loading & front
loading washing machines.
For example, when using softened water for washing, the study showed that you will achieve better cleaning results on a cold laundry wash using half the detergent dose than if you were washing with hard water on a hot wash using a full detergent dose.
The dishwasher study presented statistically significant data showing how softened water benefits dishwashing performance & can reduce your detergent usage
by as much as 70%.
Removing hardness from water was shown to be around 12 times more effective at removing soils, 6 times more effective at reducing spotting & twice as effective at reducing filming than increasing detergent dosage. Dishes were also shown to be streak free after air drying & this was noted as being another potential cost saving benefit.