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Originally Posted by ceg4048
most NO3 test kits convert the NO3 to NO2 and that this may be a source of error if the water has an NO2 component already present.
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So does this system if it indeed uses reduction of NO3- to NO2- in the presence of Cd. And if nitrite levels in a tank will be high enough to interfere with nitrate testing accuracy most of inhabitants would be simply dead as nitrite is toxic to fish and should be at virtually 0 ppm in any established tank.
Regards.
Vladimir.