W
W
A
A
T
T
E
E
R
R
H
H
A
A
R
R
D
D
N
N
E
E
S
S
S
S
-
-
E
E
N
N
G
G
L
L
A
A
N
N
D
D
Soft to moderately soft: 0-100mg/l as calcium carbonate equivalent
Slightly to moderately hard: 100-200mg/l as calcium carbonate equivalent
Hard to very hard above 200mg/l as calcium carbonate equivalent