Laundering is a complex process, and detergents have changed considerably over the last 20 years. The research reported will be of benefit to both Extension educators and teachers in advising people with whom they work on choices between different types of laundry detergents when it comes to laundering. Liquid detergents washed equally well in both soft and hard water. Powdered detergents were better than liquids in soft water. Water hardness affected powdered detergents, and, depending on the detergent type, 10-15% to > 30% extra detergent was needed to obtain a result similar to that of soft water.
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Camerson, B. A. (2011). Detergent Considerations for Consumers: Laundering in Hard Water—How Much Extra Detergent Is Required?. The Journal of Extension, 49(4), Article 21. https://tigerprints.clemson.edu/joe/vol49/iss4/21