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m <br /> a <br /> d <br /> z <br /> 0 <br /> MAXIMUM CHROMIUM <br /> CONCENTRATION LIMIT <br /> z ALLOWED FOR <br /> DISCHARGE <br /> u 50 — — — — <br /> z • <br /> 0 <br /> u <br /> 30 PPM 20 PPM 10 PPM 5 PPM HEXAVALENT I PPM <br /> CHROMIUM <br /> o CONCENTRATION <br /> i TO SYSTEM INLET <br /> u <br /> w <br /> w <br /> = 25 <br /> i <br /> w <br /> J <br /> LL <br /> w I PPM <br /> L <br /> w <br /> N <br /> N <br /> • <br /> 0 <br /> 0 2 4 6 B 10 44 46 <br /> SYSTEM THROUGHPUT. MILLIONS OF GALLONS t <br /> 0 5 10 IS 20 25 110 115 <br /> DAYS OF OPERATION BETWEEN REGENERATIONS <br /> FIGURE 7 <br /> SYSTEM THROUGHPUT TO <br /> BREAK THROUGH <br />