This information is provided for your convenience. It is not meant to supersede any instructions provided by the equipment manufacturer or your pool builder. Pool Emporium, Inc. assumes no liabilities.


Here is the actual Langlier Saturation Index, to approximate your water balance the old-fashioned way. Find where your readings on the table, guestimating as best you can, and write down the factors. Add your pH to the list, and total it. If your Total Dissolved Solids (TDS) are under 1000, subtract 12.1. If your TDS is 1000 and over, subtract 12.2. The result is the saturation index of your pool water.

SATURATION INDEX

Temp °F

Factor

 

Calcium
Hardness

Factor

 

Total
Alkalinity

Factor

32

0.0

 

5

0.3

 

5

0.7

37

0.1

 

25

1.0

 

25

1.4

46

0.2

 

50

1.3

 

50

1.7

53

0.3

 

75

1.5

 

75

1.9

60

0.4

 

100

1.6

 

100

2.0

66

0.5

 

150

1.8

 

150

2.2

76

0.6

 

200

1.9

 

200

2.3

84

0.7

 

300

2.1

 

300

2.5

94

0.8

 

400

2.2

 

400

2.6

105

0.9

 

800

2.5

 

800

2.9

128

1.0

 

1000

2.6

 

1000

3.0


EXAMPLE (TDS is 1200):

Temperature

84°F

0.7

Calcium Hardness

300

2.1

Total Alkalinity

100

2.0

pH

7.6

7.6

Total

12.4

Subtract

12.2

Result

.2

WHAT THE RESULTS MEAN

Result

Explanation

-0.2 to 0.2

Water is within tolerance

0.2 to 0.4

If your water is kept in this state, scaling is a possibility

0.4 to 1.0

If water is kept in this state, scaling is likely

1.0 and over

Water is scale forming and should be adjusted immediately

-0.2 to -0.4

If water is kept in this state, corrosion is a possibility

-0.4 to -1.0

If water is kept in this state, corrosion is likely

-1.0 and over

Water is corrosive and should be adjusted immediately


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