The hardness of water refers to the concentration of minerals, primarily calcium and magnesium, present in the water supply. The hardness of water can vary depending on the source and location.
In the context of a dishwasher, hard water can have certain effects on the cleaning process and the appliance itself. The minerals in hard water can react with detergents and form deposits, leading to issues such as spots, film, or residue on dishes and glassware. Additionally, mineral buildup can accumulate in the dishwasher's internal components, reducing its efficiency over time.
Water hardness is typically measured in grains per gallon (GPG), parts per million (PPM), or milligrams per liter (mg/L). The classification of water hardness is as follows:
- Soft water: 0-3.5 GPG or 0-60 mg/L
- Moderately hard water: 3.5-7 GPG or 61-120 mg/L
- Hard water: 7-10.5 GPG or 121-180 mg/L
- Very hard water: Above 10.5 GPG or 180 mg/L
It's worth noting that dishwasher manufacturers often provide guidelines regarding water hardness and recommend adjusting detergent usage or using water softening agents, such as dishwasher salt or rinse aids, to mitigate the effects of hard water. Some modern dishwashers also have built-in water softening systems.
To determine the exact hardness of the water in your specific location, you can contact your local water utility or use a water testing kit to measure the mineral content.