Aquathin ASC25K/F Getting Started page 25

The following guide defines your water's hardness based
on two different measurements. Our test determines the
grains of hardness that can easily be converted into the
ppm.
Grains of
Description
Hardness
Soft (ideal) 0.0—1.0
Slightly
1.0—3.5
Hard
Moderately
3.5—7.0
Hard
Hard 7.0—10.5
10.5—
Very Hard
over
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Laundry
Parts per
Detergent
Million
Required
1/4
0—18
dispenser
1/4
18—60
dispenser
1/2
60—120
dispenser
1/2
120—180
dispenser
180— Full
over dispenser