Water Balance

Water Balance

Water wants to be in balance, and it won't take NO for an answer. Water is in balance when it has just the right amount of calcium and other minerals in solution. If it has too much, water will release the excess calcium causing ugly and equipment-clogging scale. If the water is lacking calcium and other minerals, water will pull it from plaster walls (called etching) or from equipment. 

A well-balanced pool is the easiest stain prevention step you can take.

Langelier Saturation Index (LSI)

The  LSI is an approximate indicator of the degree of saturation of calcium carbonate in water. Simply, it is a great way to see if you water is in balance.

LSI is calculated using:

  • pH 
  • Water Temperature in F
  • Calcium Hardness (CH) 
  • Total Alkalinity (TA)  
  • Total Dissolved Solids (TDS)                                                                  


LSI below -0.3:  Water is in need of calcium. Water will pull calcium and TDS from pool walls, pipes or any other available source.

LSI equals -0.3 to 0.3:  Water is in the balanced range. A score of 0 is considered neutral.

LSI above 0.3: Water will give up its extra calcium by depositing scale on pool surfaces and equipment.

Calculate Your LSI

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