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9
Water Balance
11.0 – 12.0
12.1 – 12.3
12.4 – 12.6
12.7 – 12.9
13.0 – 14.0
Condition of Water
Corrosive
Acceptable Balance
Ideal Balance
Acceptable Balance
Scale forming
Recommendation
Increase pH and/or Alkalinity
Retest water frequently
Retest water frequently
Reduce pH and/or alkalinity
WATER INDEX REFERENCE TABLES
Pool water conditions
Temperature 30°C
pH 7.2
Alkalinity 80 mg/L
Hardness 230 mg/L
Factor value
(nearest values)
TF = 0.7
pH = 7.2
AF = 1.9
HF = 2.4
°C
0
4
8
12
16
20
24
28
32
36
40
50
°F
32
39
46
54
60
68
75
82
90
97
104
122
TF
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.7
0.8
0.9
1.0
mg/L
(as CaCO
3
)
5
25
50
75
100
150
200
250
300
400
500
1000
HF
0.7
1.4
1.7
1.9
2.0
2.2
2.3
2.4
2.5
2.6
2.7
3.0
mg/L
(as CaCO
3
)
5
25
50
75
100
150
200
250
300
400
500
1000
AF
0.7
1.4
1.7
1.9
2.0
2.2
2.3
2.4
2.5
2.6
2.7
3.0
Temperature Calcium Hardness Alkalinity
EXAMPLE:
Water Balance = pH + TF + HF + AF
= 7.2 + 0.7 + 2.4 + 1.9 = 12.2
Conclusion: the water is acceptable balanced but there is some risk
that the water becomes corrosive; frequently testing is recommended.
The Hanna C216 and C226 are the ideal instruments to meet your
monitoring requirements….