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What are the recommended chemical parameters?
What is the Langlier Index formula?
What are the recommended chemical parameters?
A complete water test by a qualified professional pool company such as Buddy's Pool
Service, Inc. or other BioGuard authorized dealers is always the best method to be sure
all variables are considered. The Langlier Index is a formula used in most
professional water treatment calculations and considers five major factors and how they
relate to each other to assure proper water balance. These five factors include pH,
temperature, alkalinity, calcium hardness, and total dissolved solids. A
Computerized Water Analysis Program such as Alex, always takes all possible factors into
consideration to eliminate the guess work. However, the National Spa & Pool
Institute has developed a set of helpful guidelines for chemical maintenance of water
quality. These are to be used only as guidelines since other factors in the Langlier
Index calculations may require adjustments outside of this range to put pool in
proper balance.
| NSPI "Ideal" pool
chemistry parameters |
| Free Chlorine |
1-3 ppm |
| Combined Chlorine |
0 ppm |
Bromine
(for bromine systems only) |
2-4 ppm |
| pH |
7.4-7.6 |
Total Alkalinity
(varies with pool type) |
80-180 ppm |
| Total Dissolved Solids (TDS) |
1000-2000 ppm |
| Calcium Hardness |
200-400 |
Cyanuric Acid
(for chlorine systems only) |
30-50 ppm |
| Source: ANSI/NSPI-5 1995 |
What is the (Langlier) Saturation Index?
The Saturation Index, also known as the Langlier Index was developed in the 1930's by Dr.
Langlier. It is used to determine the waters tendency to be acidic (corrosive water)
or basic (scale forming water).
| Saturation Index is equal to the pH plus the Temperature
Factor (TF in ºF) plus Calcium Hardness (CF) plus Alkalinity Factor (AF) minus a TDS
Factor (-12.1) |
| SI = pH + TF + CF + AF - 12.1 |
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