The Hamilton Index

The Langelier Saturation index was designed for underground water pipes used by municipal water districts. The Pool & Spa industry began using it in the early 60's, as they had no other water balancing system for guidance. Since then the Langelier has been modifyed because of limits & conditions put on, that were never part of Dr. Langelier's original index. The Langelier Index is not being used, even though the pool & spa industry still calls it the Langelier Index.

Have you ever wondered why there are so many opinions on how to run your pool chemistry? The answer is simple... if you base your science on an erroneous principle, then your conclusions will be inconsistent. That means the answers that the pool and/or spa professional comes up with will be inconsistent, adding to the confusion.

The Hamilton Index, was developed by a pool technician for the pool & spa industry. This index was tested, by field service and research, over a period of 11 years. The index is so accurate, that in 20 years of field application, it has not needed to be modified. Today, there is an estimated 400,000 pool & spas being run on the Hamilton Index. Interestingly, in 1991, the National Pool and Spa Institute lowered the recommended total alkalinity towards the guide lines that the Hamilton Index has used for 25 years. But, of course, they are still calling it the Langelier Index.

Besides being very accurate, the 3 step system in extremely easy...

Step 1: Test your total hardess (Not Calcium Hardness), that tells you where to put your total alkalinity...exactly!
Step 2: Put your total alkalinity where the chart tells you.
Step 3: Keep your pH at 7.8 to 8.2