Part of the alkalinity reading is cyanurate, which does not count.
Use 1,000 if you do not test it. Saltwater pools are usually 3,000 to 5,000.
Standard pool-industry method: pH + temperature factor + calcium factor + carbonate alkalinity factor − TDS factor, with the alkalinity corrected for cyanuric acid at the measured pH. A guide for a person reading it, not a dose instruction. Retest after any adjustment.
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