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Cyanuric Acid Correction To Total Alkalinity.

The following is taken from Taylor's "Pool and Spa Water Chemistry" (rev 9/94).

"Total alkalinity is a measurement of both carbonate alkalinity and cyanurate alkalinity present in a sample. Since water balance calculations only use the carbonate alkalinity portion, a a correction (which varies with pH) should be applied to compensate for the cyanurate portion."

They further state: "Note: While Taylor Technologies recommends using the correction, some industry professionals remain skeptical and question its value."

It works for me I seem to have far less variation on a daily/weekly basis if I use the adjustment.