Calco-carbonic balance is essential for maintaining high-quality pool or spa water. It ensures that the water is neither too corrosive nor too scaly, thus preventing problems such as equipment deterioration or scale formation. This balance is based on three main parameters: hardness, alkalinity and pH.
There are two commonly used methods for calculating this balance: the Langelier Scale Index (LSI) and the Taylor scale.
1. Langelier index (LSI)
This analytical method is more technical. It is based on a calculation that takes into account water temperature, pH, hardness, alkalinity and calcium ion concentration. The result of this calculation gives an index:
If the index is positive, the water is scaling.
If the index is negative, the water is corrosive.
An index close to zero indicates that the water is in equilibrium, which is ideal for preserving your equipment and water quality.
2. Taylor's balance
The Taylor balance is a simpler graphical method for determining calcium-carbonate balance. It involves placing pH, alkalinity and hardness measurements on three parallel axes. Then, simply adjust one or more parameters to align these points within a defined area on the graph, usually the “blue zone”. The aim is to ensure that all three values fall within this zone, guaranteeing an ideal balance for your pool or spa water. This method is more accessible, but less precise than the Langelier index.
In short, to maintain balanced water, you can choose either of these methods according to your preferences. If you want maximum precision, the Langelier index is recommended, while the Taylor scale may be quicker and more accessible for pool owners. In both cases, the aim is to ensure the stability of your water and protect your equipment.