The nitrate-N levels were generally below the maximum contamination levels of 50 mg/l set by the WHO. In the raw materials the levels were relatively high. 105 out of 180 samples analyzed for nitrite had levels above the maximum contamination levels of 0.03 mg/l level for water. Phosphate-P were also found to be high in the homemade brews, 102 out of 180 samples analyzed had levels above the maximum contamination levels of 2.2 mg/l for water. The levels of nitrate levels in raw materials used in... Mehr