General Water Hardness

General Water Hardness
0 to 4 dh	0 to 70 ppm	Very Soft
4 to 8 dh	70 to 140 ppm	Soft
8 to 12 dh	140 to 210 ppm	Medium Hard
12 to 18 dh	210 to 320 ppm	Fairly Hard
18 to 30 dh	320 to 530 ppm	Hard
>30 dh	>530 ppk	Very Hard