## What is Langelier Saturation?

The Langelier Saturation Index (LSI) is a cornerstone of the Orenda program. The LSI is the unbiased measurement of water balance, as defined by calcium carbonate saturation. It determines if our water is aggressive/corrosive (low LSI), balanced, or scale-forming (high LSI).

What does the Langelier Index measure?

The Langelier Index is an approximate indicator of the degree of saturation of calcium carbonate in water. It is calculatedOpens in new window (58 KB) using the pH, alkalinity, calcium concentration, total dissolved solids, and water temperature of a water sample collected at the tap.

How is Langelier Saturation calculated?

LSI Formula: A = (Log10[TDS] – 1)/10 = 0.15. B = -13.12 x Log10(oC + 273) + 34.55 = 2.09 at 25°C and 1.09 at 82°C.

If LSI is negative: No potential to scale, the water will dissolve CaCO. If LSI is positive: Scale can form and CaCO3 precipitation may occur. If LSI is close to zero: Borderline scale potential. Water quality or changes in temperature, or evaporation could change the index.

What is LSI in Ro?

LSI (Langlier Saturation Index): LSI is a method of reporting the scaling or corrosive potential of low TDS brackish water based on the level of saturation of calcium carbonate.

What is LSI in reverse osmosis?

#### How can I increase my LSI?

To raise your LSI value, add sodium bicarbonate or baking soda (can be found in pool supply stores). Consult the calculator above to determine the target Alkalinity value (recommended range is 80-120ppm; however, you may find that a level lower than 80 may be ideal for a balanced LSI value).

How do you raise the LSI in a pool?

How do I lower my LSI?

To lower your LSI value, add muriatic acid (can be found in pool supply stores). Consult the calculator above to determine the target pH value (recommended range is 7.2 to 7.6).

## How do you increase LSI in water?

What is hardness of RO water?

A relatively “hard water” with 10 grains per gallon (171.2 mg/L) of hardness (as calcium carbonate) results in only an additional 79 mg/L of sodium when softened.