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To be fair to them - they probably referring to fresh water but still - it is a remarkable statement. They do not base their statement on own research, or known chemical pathways - they rely only on what other have reported. They also say that high nitrate concentrations is lethal - they are not, not even in fresh water IMEI'd be surprised ANY of those customers actually had lethal levels of nitrate or nitrite before adding Prime. it is not easy to attain acutely lethal levels of nitrate or nitrite in seawater. The data I collected for nitrite suggest the lowest lethal concentration of nitrite I could find was 147 ppm. Does anyone believe that any customers using Prime had nitrite of 147 ppm?