The combined limit is a separate comparisonCl = 800 ppm≤ 900 ppmBr = 800 ppm≤ 900 ppmCombined: 800 + 800 = 1600 ppm > 1500 ppmSame specimen basis assumed; illustrative arithmetic only³Ô¹Ïtv · Original engineering explanation · Not a test report or production evidence