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WATER SOFTENER (SOME MODELS ONLY)
*ppm = parts per million | **gpg = grains per gallon.
SETTING
WATER HARDNESS SCALES
PPM* GPG** °DH °FH °E / °CLARK MMOL/L
0 0 – 100 0 – 6 0 – 5.6 0 – 10 0 – 7 0 – 0.1
1 100 – 250 6 – 14 5.6 – 14 10 – 25 7 – 17.5 0.1 – 2.5
2 250 – 350 14 – 20 14 – 19.6 25 – 35 17.5 – 24.5 2.5 – 3.5
3 350 – 450 20 – 26 19.6 – 25.2 35 – 45 24.5 – 31.5 3.5 – 4.5
4 450 – 550 26 – 32 25.2 – 30.8 45 – 55 31.5 – 38.5 4.5 – 5.5
5 550 – 625 32 – 36 30.8 – 35 55 – 62 38.5 – 43.8 5.5 – 6.2
Water hardness recommendations
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Use the table below to determine the optimal water hardness setting. Your local water
company will be able to help.
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If you have a household water softener installed, use the setting recommended for water
with a hardness under 100 ppm/6 gpg, irrespective of the water hardness in your area.
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If your water hardness is above 625 ppm/36 gpg, the wash performance of your
DishDrawer™ Dishwasher will decline over time. The rinse aid setting should be at 5.
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