another thing to condsider is that the amount of hypochlorus acid in the water is going to be minimal and most of your chlorine will be in the form of hypochlorite ions at that high a pH. Hypochlorus acid is what actually is a sanitizer, hypochlorite ions are not.

SWGs are different because they are producing sodium hydroxide (lye) when they generate chlorine which is what causes the pH rise. Running a high pH pool is more of finding where a plaster pool wants to go and not fighting it all the time when sanitized by manual chlorine addition.

To test pH that high you need a different indicator and test block or a pH meter. That pH range is not normal for pool/spa use so you will have to look outside of the pool test kits to find it.Taylor and LaMotte probably have some kits that will test that pH range (I bellive that some of LaMotte's soil testing labs do) but be aware that you are getting into 'experimental waters' so to speak.

The Hamilton Index is what is ususally used to run a pool at a higher pH and that does not use Calcium hardness but rather total (calcium and magnesium) hardness in the equation. Temperature becomes much more important in this equation also and it is accepted that the sanitizing abilities of the chlorine are lessened too.

The Hamilton index is probably about as useful as the Langelier and Ryzner indecies for balancing a pool which, IMHO, are not really usefull tools. (But that is a different and somewhat technical discussion that is probably best in the China Shop!)