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32 PoolDirect 9in1_4i 11/2015
Water Balance (Langelier Saturation Index)
When water is in balance, it is said to be neither corrosive nor scale-forming. In other words,
it will not deposit a layer of calcium scale neither will it dissolve an existing layer of scale.
For Langelier calculation the following tests are required:
• pH Value
• Temperature
• Calcium hardness
• Total Alkalinity
• TDS (Total Dissolved Solids)
Run each test separately and note the results.
Calculate the Langelier Saturation Index as described below:
Calculation of Water Balance (Langelier Saturation Index):
If you want to enter values like 7.5 use the store key as decimal point.
With Mode 71 (see below) it is possible to select between degree Celsius or degree Fahren-
heit.
Press [Balance] key
The display shows:
Enter the temperature value (T) in the range between 3 and
53°C and confirm with [ ] key.
If °F was selected, enter the temperature value in the range
between 37 and 128°F.
The display shows:
Enter the value for Calcium hardness (CH) in the range bet-
ween 50 and 1000 mg/l CaCO
3
and confirm with [ ] key.
The display shows:
Enter the value for Total Alkalinity (TA) in the range between
5 and 800 mg/l CaCO
3
and confirm with [ ] key.
The display shows:
Enter the value for TDS (Total Dissolved Solids) in the range
between 0 and 6000 mg/l and confirm with [ ] key.
calcium hardness
50<=CH<=1000
+_ _ _ _
<Langelier>
temperature °C:
3°C <=T<=53°C
+_ _ _ _
tot. alkalinity
5<=TA<=800
+_ _ _ _
total dissol. solids
0<=TDS<=6000
+_ _ _ _
Balance