ASKO W6903 - Manual (Page 16)

Recommended detergent amounts based on water hardness
Detergent amounts
Main Wash Pre Wash Water hardness
1 to 1-1/2 tablespoons 1 teaspoon Soft (0-3 grains per gal.)
1 to 2 tablespoons 1 teaspoon Medium (4-8 grains per gal.)
2 to 3 tablespoons 1 teaspoon Hard (9+ grains per gal.)
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Advice and tips before washing