How do I determine my water hardness level?

Run water at your kitchen sink for 5 minutes, then dip the included water hardness test strip into the tap water for 1 second and shake off excess water. After one minute, compare the test strip to the chart provided in the manual to determine your dishwasher water softener setting. If you purchase a different test strip, follow the manufacturer's instructions on that product.

From the official Bosch 500 Series SHXM63WS5N Dishwasher manual, page 13

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